I got a ton of great ideas and advice from this forum while shopping for our first spa last year. So, I thought I'd post our experiences to date with the one we wound up buying in the event this is helpful for others.
We considered and wet tested spas from Hotspring, Dimension1, Sundance, Arctic, Jacuzzi, and a local private label and wound up buying a Costco (Strong) Evolution CSXi80 online from Costco. I think we would have been happy with any of the spas we looked at. Having a family soak, a soak before bed, a soak with friends, a soak after a long hike or round of golf and a place for the kids to splash around are what these things are all about for us. I think all of them can deliver that experience. Your goals may be different of course.
We are delighted with our purchase and the spa has met or exceeded all of our expectations.
What we like about it:
Price -- we paid $4,700 plus $150 to have a spa mover move it to the crushed rock pad in the back yard. This was a lot less than the other spas we considered from the major brands which ranged from $8,000 to $12,000 (the local private label was close at $5,500 but no return option). The price included matching steps and a tapered cover.
Costco's return policy -- this basically removed all of the risk in the decision for us. You can get your money back from Costco any time you want. For $200, the local spa mover will move it from my backyard to Costco's receiving dock. I confirmed all this with the Costco manager at our local store. I couldn't find any spa dealer willing to match this (and who can blame them).
Seating configuration -- deep captains chairs with two different heights (his & hers basically). Other seats at other heights including a "cool down" seat which doubles as a step into the tub. We wanted an open seating configuration because our kids tend to "swim around" in it.
Large footwell -- handles 2 adults and 2 kids pretty well.
Jets -- Each jet can be turned on or off individually. Also, two of the seats have neck / shoulder jets which do a pretty good job.
Air control -- 4 air controls make it easy to target where you want the air
Standard components -- I am comfortable with basic maintenance tasks and I found I could buy all of the parts for this spa online easily and inexpensively should I need to do work on it in the future. Balboa controls, Waterway jets, AOSmith/Waterway pumps. The design and construction is very straightforward if you are into doing your own maintenance. The cabinet configuration also makes it very easy to get inside and get to the plumbing, pumps and controls. Documentation is easy to find and you can't beat the troubleshooting and repair advice you get from this and other forums.
All plastic / fiberglass (no wood) -- Strong is into "rotomolding" and thus the spa's entire construction is plastic and fiberglass. It also has a beefy plastic floor which Strong says you can put right onto a dirt surface. No wood to rot.
Lights -- it has Balboa's basic LED light control and a variety of lighting settings. My kids like it. I almost always sit in the dark and look at the stars or moon. It looks nice all lit up when we have backyard parties.
What we wish was different:
5HP motors instead of 4HP -- I would like a little more oomph in the jets during the short time I use them on full blast. They are pretty good as is, and if I turn off the jets I'm not using, the power is fine but if these motors ever burn out, I'll replace them with 5HP instead of 4HP. My wife is perfectly happy with them as is. We rented a house recently that had a Hotspring with 5HP jets and you could definitely feel the difference.
"Volcano Jet" -- a few of the spas we looked at had a cone shaped jet in the footwell that would deliver a major foot massage. We have a few foot jets in this spa, but nothing like the "volcano jet" we tried!
More flexibility programming the filtration and heating cycles -- The Balboa control unit has about a dozen different settings to control the amount and timing of filtration and how the spa handles the heating cycle. I would like the option to fine tune these settings. Not a huge deal.
Usage Notes -- here are some random notes about how we use the spa that you may find helpful:
BBB or "Dichlor-then-bleach" water maintenance method. I read about this here and on another forum and tried it from the beginning. What a great system. We went almost 4 months before our first drain and refill and our water looked, smelled and felt terrific the entire time. I thought we would go with the Nature2 system but after 4 months just using BBB, I am sold. Highly recommended!
Drop Test Kit -- Order this or buy it before you get your spa. Having accurate test results makes the whole process of learning to manage your spa water so much easier.
Ozonator -- I thought this would be a really important feature, but now that we've had the spa I don't think I'd replace it if it broke (actually it may be broken for all I know). I'm not sure I am really gaining much having the ozonoator. The BBB method seems to be the key.
We have the filtration cycle set to "2" which means it filters 2 hours twice per day or 4 hours total. This has been sufficient to keep the water clean. I clean the filter cartridge every other week with a spray filter cleaner and a quick rinse. It never seems that dirty.
We keep the heater set at 104 and in the "Economy" mode which means it only runs the heater during the filtration cycles. We have the filtration cycle running from 7am - 9am and 7pm - 9pm. During the 10 hours between cycles, the temp seems to drift down 1 to 3 degrees (Northern California fall/winter temps). By having the filtration / heater run at these times, the water is usually at the right temp during the times we use the spa (evening after dinner and night before bed).
I opted to build a 4" thick crushed rock pad framed by pressure treated 2 x 4s. Strong says you can put the spa right down on level dirt but I opted for the rock to provide better drainage and a more stable surface. So far after 4 months and A LOT of rain, it is working perfectly. I had the electrician route the electrical conduit under the pad and we drilled a hole in the spa floor to lead the wiring up through the bottom. Easy to do.
Cover lifter -- I thought I would wind up buying or making a cover lifter but at this point I don't think we will. It is easy enough to slide the cover off the back of the spa and prop it up against the side. It's low and out of the way when we slide it off. I just don't think the cover lifters look very good and many of them leave the cover standing up pretty high when open. My wife agrees.
Typical usage -- I typically sit in one of the captains chairs for about the first 10 minutes of a soak with the jets and air on high. Then, I turn the jets off or on low and move around to one of the other seats and take in the view and the quiet. I mention this only because having a bunch of different hydrotherapy jets turned out to be not such an important thing for us. Same with waterfalls and lights. Nice, but not critical to the experience. Your goals here may be different.
Stereo vs iPod -- I thought I might install waterproof speakers and a car stereo in the shell for music but at this point tossing my ipod on the propped up cover behind me works pretty well. I think if I had the stereo installed I'd have to turn it up pretty high to hear it and that would create noise late at night that the neighbors may not be wild about.
Towels vs Robes -- Someone gave us this tip and I recommend it. Instead of towels, get everyone a fluffy terry cloth robe. When you get out, wrap yourself in the robe instead of a towel. Hang it up to dry when you get back in the house. Since you are clean when you get out, you rarely have to wash the robe and its much warmer than a towel when you are making the dash back into the house on a cold night!
Finally, one of the things I didn't expect was what a nice family time the spa creates. For whatever reasons our 10 and 12 year old kids love to chat about their day when we are all sitting in the tub after dinner -- much more so than at other times. A nice side benefit we didn't expect.
Happy to answer any questions. Thanks to everyone for putting out such good advice and for the diversity of opinions and ideas on this forum.