Our Fanta-Sea Add-a-Deck is going into its 4th season. You can find pics in the "What does your pool look like?" thread.

Island Pools has been very honorable and has stood behind their product. Installation, though, is not a job for the faint-hearted, especially the longer pools. The long girders on my 40'x16' are close to 900 lbs each! You'll need at least 10 strong guys to pick each up--or rent a BobCat (That's what I had to do).

Building it into an exisiting deck is tough because it's hard to get straight EXACTLY how much below the deck the site should be. I ended up having to compensate for it being about an inch higher. Since the town required me to put the fence between the existing deck and the pool, it worked out OK.

Here are the problems I have had:
1) Their best installer is a contractor for them, and while he knows the pools extremely well, he's rather difficult and has lousy client manners. But he knows the pools well, and structurally it's perfect.
2) His sidekicks who did the plumbing did a terrible job and it started leaking immediately. Do not let them use TigerFlex with interior barbed fittings and hose clamps. TigerFlex MUST be used with Schedule 40 glue-on fittings. It should not be a big deal--glue-ons are actually easy as pie to use and they don't cost a lot--and they don't leak. The solar panel connections leaked and Island Pools ended up sending me a full set of extra clamps to double clamp them, which worked. I re-did the main plumbing myself and it's much better.
3) The liner failed 10 days after the install--a bad liner from the factory, not a bad install. Island Pools worked with the liner company to set up a new liner, and a local installer to install the new liner. IP paid for the replacement water.
4) Panels occasionally leak. IP has replaced them for free.

The system works. However, I have found it to work MUCH better by dividing the panels into two separate groups. I have a tee and two valves, one for the NW group, and one for the SE group. Each has its own return at the far end of the pool. Each can be turned on independently, so only the ones in the sun are running, or both together, which flows FAR more water with less resistance than the factory setup. I've talked to them about this and suggested they implement it--If I spent $50 on the extra fittings that's a lot...

Ours is a custom size--32x16 and 40x20 or 40x12 are standard. We have 40x16--not a big deal for them. The liner is custom cut and has a 5 1/2 foot deep end. Despite the issues, we love it. It's hard to tell it's not an IG as we use it as one.