Hi gepert - I have some feedback.
I previously owned an Arctic with Peak Ozone but I now have the new (2008) Summit with Onzen.
Both systems are great. It is true the Onzen is finicky but I'm starting to get used to it. Part of my problem at first was "too much salt". I like the system, but I need to add more chemicals than I expected to keep the PH and alkalinity under control. I'm still not sure which system I would order if I was to buy another. Onzen needs better user documentation and the low level programming to control it is a pain.
The new tub design (seat layout etc) is much better than the last summit I had and the new Jet system is a leap forward. Not a single jet has fallen out (not that they should in the first place, but all brands of tub that I have used had that problem).
Service is another story. I have been waiting 35 days and counting for a service call to fix the Onzen system which stopped producing sanitizer. I have called the folks in Nanaimo 3 times to get an update and apparently they are still waiting for parts from Arctic. Last time I called, they hung up on me when I suggested we follow up with Arctic. (The same fellow is listed as the Complaints Contact at BBB)
I have a certificate here that guarantees 24 hour service - do they still hand those out?
From my experience, over the years with Spas (various dealers / manufacturers), post-sales service has ranged from excellent to appalling. That part baffles me...
Sorry to see Tom leave - just when I need him. (long time listener, first time caller)
Hope to here from you James.