I have had every problem you two have listed with my D1 Lotus Bay spa. I bought mine in 2006. My dealer unfortunately went out of business. D1 is excellent, until the warranty runs out! The control panel failed 4 times because of a water intrusion defect, and they replaced it until the warranty ran out. Now I will have to buy and install the $500 unit myself each year when it malfunctions. I was told the last time they replaced the control panel, that they had fixed the problem. The new "fixed" one they sent me not only has the water intrusion, but there is now nothing showing on the display so i cannot even set the temperature.
I too have the fountain issue. Every time I refill the tub the fountain stops working and then eventually starts up again (A month or so later). The underwater control buttons have crumbled so many times I no longer replace them. The pillows also crumbled each time I replaced them (At a cost to me since it is blamed on my spas" chemistry"). I finally stopped replacing them. I always check my water chemistry and I follow their guidelines and the crumbling continued This is only a sample of issues I have had. The clincher is the drain guard that breaks easily. They discontinued the part, and they have run out of replacements, so at this point using the tub is dangerous I asked the service tech what to do since it is dangerous to operate without the drain covers, and he just replied "sorry, we do not make those anymore". So a "Lifetime" shell becomes pointless in a tub that is useable for such a short period of time.
As far as the Ozone part, from what I have been told, they need to replaced every year or two, so I consider that standard maintenance. (Something to consider in terms of operating costs since they are expensive). During warranty, D1 did help some of my concerns, but after the warranty time period, I am stuck with a huge spa that will cost a lot of money to remove. The D1 management seems to encourage interaction until the warranty runs out.
