I had the larger one of these and it lasted about 4 hours (on a thick tarpaulin on top of lawn), initially it split at a joint (and I managed to repair using gorilla tape), but the same thing happened on another joint after another day of use. This was when just my timid 3 year old was using it too, it wasn't like it was being jumped on etc. I'd usually give the benefit of the doubt but it seemed to me that the fused seams had been over-compressed so the join was thinner than the material (as it did seem to be of reasonable thickness). I'd advise avoiding it, but at least Amazon are pretty good with returns etc. (if you fancy packaging a waterlogged pool to send back)!
Got this on the last deal. Great little pool for the price! Would definitely recommend buying an electric inflation pump for about £10 though. You won't be able to pump this up manually.