service from your dealer would be high on my list
moto massage has been around forever not a big deal
all hot tubs filter great, best to avoid high filter costs d1 and hs are the worst for filter exspense
shells are vulnerable and when d1s fail they may send you a fix it yourself kit (check the details)
ozone and uv are helper sanitizers, you still need chlorine or bromine ,plus ozone frequently builds up under your cover burning it and you will need to buy a new cover too soon, you can use less chemical but you how hard that is to keep your chlorine @ 1ppm forget it, best to go with salt water purification (bromine generator, must be plumbed to 24 hr circ pump)