Oh how I want to write a good review but I have owned like 5 of these already.  Forget year to year it's more like 2 per season.  The air chamber on top tends to either come with or quickly develop tiny holes.  SInce it is that which keeps the pool up, once the baloon thing goes the pool is useless.  Hours with soap trying to see where the bubbles are coming from, patching, starting over... then you have other issues.. if you aren't near it when it is filling it could fill lopsided, if that happens you may end up with the filtration portion not submersed at which point you have to start over.  Should you have to start over oy vey, the hole to remove the watter takes a whole day but worse than that it's a couple inches off the ground so when it's done draining you are still left with a bunch of water in there... do you spill it out? yeah if you are Hercules, I can't, so you grab a basin and dump until you can turn the whole thing over, by which time it stinks to high H and it's riffled with mosquitoes... oh and the water treatment is as bad as a real pool, cholorine check, algae treatment, who can be bothered, you just keep emptying the darned thing.  also, the thirty day warranty is an option, sure, but once you have filled that sucker with water how on earth are you EVER going to fold it back neatly enough to return it? You aren't.  If you bought local you can drag it to the store while the kids moan the whole way but on Amazon it's a whole new story which is why i just kept buying new ones twice a year. This year however  I was SUPER LUCKY that this last one came with the same issue and had to go back literally within a day or so of me using it and the CSR took pity on me and didn't make me return the old one, I just dragged it to the trash.  So... you may ask, why the heck do you keep buying them...? Because I always keep thinking I have mastered a new way of making it work and withing the pool context it is still very affordable...