Well since this thread has had so many reads I'll go ahead and tell you what I think.
I have owned this spa for about 3 months now and so far so good. I really like it and the price was just awesome ($2999 + $200 shipping). The price has since gone up to $3999 with free shipping.
The jets are powerfull and there are plenty of them. The lights are kinda nice too. The waterfall doesnt get used much. I really dont know why you need it.
I checked this spa over with a fine tooth comb when I first got it and the workmanship seems to be very good. I was looking for flaws and sloppy workmanship and I coundnt find anything at all.
There is only one thing I dont like about this spa, the lounger is a bit cramped lengthwise for a taller person. I am 5'10 and I wish it were a couple inches or so longer. I have to bend my knees a bit but no big deal, I guess. Also, two foot massagers here instead of one would have been nice. If the spa was a full 7 feet instead of only 6 1/2 it would be just right.
I was reluctant to buy this spa online without a lot of knowledge about it but since it was Costco I knew the worst case scenario would be that I could just return it for a refund so I decided to roll the dice.
It wasnt completely painless however, the two guys who delivered it almost dropped it off the truck unloading it. I mean it was really close to falling! It was standing on end and the guy lost control of it and it began to fall off the back end of the truck. Fortunately, it hit another spa next to it which was the only thing that prevented it from falling off the truck!
After having it wired I found out the jumper on the circuit board was set for 30 amps rather than 50. The owners manual said the default jumper setting was 50 amps which was wrong, so I had to have the electrcian out again to figure out what the problem was.
The spa cover must be for a 7 foot spa because it has a small gap of a couple inches around the outside edges. However it seems to seal well and does lock and I havent had any other probems with it.
I also bought the cover lift for this spa off the Costco wesite. The mounting brackets really didnt match up too well so I had to make some shims out of some old pressure treated lumber to secure it to the base of the spa. That solved that problem.
All in all, for the price I think it was a good deal. I dont have any regrets except I wish I had about 10k to spend on a spa. Then I would have bought something a little bigger and fancier.
Hope this helps.