The Discovery 440 DL at Costco.com is actually a Keys Backyard KB440DL. The costco.com photo of the spa is of a slightly different model. We got the spa delivered to our driveway 4 weeks ago, spent $600 for electrical work, muscled the spa back to the patio. 3 weeks ago.
Pros -- it basically works.
The jets are okay, placement and jet strength is adequate.
Costco returns policy.
Cons -- waterfall only partially works (water only comes out of the right half of the slot).
Jet controls have a cheap feel to them, and are hard to grip (bits of plastic from the molds that should have been shaved off better.
When ozonator was plugged into the board, the breaker popped. Called costco, they got me another ozonator in about a week, works fine now.
Very simple controls.
Manual looks like it was mimeographed, so the pictures in the manual are pretty much useless (however, you can download the manual and print it at home).
Keys to the lid lock were not enclosed. I called Keys Backyard, got new keys in a few days.
My overall assessment is that there are better deals, even at Costco. If you REALLY want to spend $4000 on a hot tub max(and I DO!), and you are prepared for a bit of up-front hassle, and you are willing to stick in some more insulation, AND you just can't accept a used spa -- this will work for you.
In the interest of disclosure, the Platinum 2 from Elite Spas is in stock at my local Costco, and I plan to go through the pushups of replacing my Keys tub with the Platinum 2 tomorrow. Will cost a bit more, but it's quite a bit nicer, and I am willing to put insulation in.