I'm finding it lasts really, really well. So far, I have not had one single chip or any peeling. My thumb nail split at the side wall the other week, but it only split as far as the iLac and no further, and it stayed that way until I removed the iLac several days later. In my opinion, it has great staying power, no chips and is so easy to remove.
The only colour I had a problem with is the black one - it wrinkled slightly but I think it was because I put it on a bit too thick. I think the black will need 3 very thin coats to avoid wrinkling.
I've only used the xLac once and I was really impressed with it - lasted well over a week with no chips or peeling (I only removed it because I was getting bored with the colour lol)
I asked about the black and they said because of the dark pigmentation, to cure for longer, like an extra 10s. I ted to do 60 seconds for black. X