If you're meaning "Jacuzzi Premium Spas", then I think you'll get quite a few responses here.
I personally own J-355 and really enjoy it. The therapy is excellent, and the asthetics of the tub are top notch. I'm expecting the same with product quality as they've teamed with Sundance, and have been around forever.
The tubs tend to be priced below Sundance and Hot Springs, but you get great value for your money at the same time.
Mark