my parents are on their second one. They keep it on an enclosed porch year round (mild winters). Only problems have been wrinkles developing in the liner, and fading of the tub. I enjoyed it, but chose to get a 'regular' tub because I wanted more comfortable seating and a heater (mine is outdoors in cold winters). I'm not sure, but I think they don't have separate heaters - that the jet pump does the job...
As for not having as many jets - you may not mind - often we are just happy soaking in hot water, or with mild jets only...