I can tell you that they have a picture of a HotSpring Prodigy on their home page. It's the one with all the frat boys piled in it.
They look just like every other backyard kit spa on the market. That may sound cynical, but it's the truth. You could probably build an identical spa yourself for less than $1,000. Just get any pool and spa magazine and order the parts, it looks like that's what they did.
If you do buy one, go ahead and start saving your money because you will be buying another one in a couple of years. Good luck!
Terminator