First off, this mattress is very solid built and hasn't leaked at all since I aired it up 3 days ago. Overall the build quality is really great and I see this holding up much better than past air mattress's. My only reason for the 4 star rating is that mine was NOT exactly like the one shown in all the pictures (search even their website and its the same as the amazon pics).
The mattress I received looks like the one in the pictures here except that the raised horizontal comfort coils are instead egg shaped raised coils. Personally I don't like this design as much, the raised eggs are annoying compared to the horizontal style. So if you don't mind that I would recommend this mattress.
UPDATE: They have now updated the image to reflect the new mattress style. I would also like to update that after a few more nights of breaking the mattress in, I am much more satisfied with the comfort. Finding the right amount of air and letting it "soften" up just a bit from sleeping on it has helped a lot. This is definitely the best air mattress I have ever had (and boy have I had a few in the past 5-6 years). I have updated my rating from 4 to 5 stars and will recommend this air mattress above all others, especially for those who use them as a long term sleeping solution like I do.
UPDATE 2/21/2012: Unfortunately I have to revise my review at this time. I have had a leak for a few nights now, waking up mostly on the floor each morning. Now, I have a cat and a dog that both play on the bed (covered with sheets and a protector of course) so I pretty much assumed one of them had finally managed to puncture the mattress. I figured this was of course no big deal, it has lasted well over a year now without a hitch. I whipped out the patch that comes with the mattress and gave it a look over. After a while of playing find the bubbles with a soapy cloth, I realized air was draining way too fast to be a simple puncture. In the end I found that the area around the cable storage had actually began ripping away from the plastic causing a fairly large tear in the mattress. This is a huge weakness, and one that could easily be avoided with a simpler cable storage design (retract into motor, storage container built into motor casing, etc...). Considering the mattress is STILL not punctured, I would say the build quality is excellent except for this one flaw, which will almost certainly cause issues in the long run for anyone else using this mattress on a nightly basis.
Basically there is too little reinforcement around the cable container, after a year or so of "stress" from nightly use, the glue or fabric finally start to give out around the edges. I suspect this could also happen to the motor area as it is almost made the same way, though it does seem to be a bit more reinforced and as of yet has not begun separating.
I managed to patch it up with some crafty duct tape work and the included patch kit, it should hold out pretty good for another year I hope (its ugly as heck though, glad I have a cover). In the long run, I think buying one of the $200-300 memory foam mattresses on Amazon would be the better bet, but if you need an airbed that will last a year without issues, this is still a good choice and much better than some $50-60 Walmart air mattress.