I have a Remora, and my wife has one, too. I use mine mostly for pocket carry, with occasional use as an IWB, and it has never given me a problem. I don't wear it IWB all day, though, and both of the pistols we use them with are Sig P238s, pretty small. My wife uses hers IWB quite a bit, and says it stays put quite well.
My only experience with bigger guns is second-hand. My daughter has one for her Beretta PX4 Compact and said it was stable. A friend had the same report with the same pistol.
Basically, they work way better than I expect. As someone else mentioned, the stickiness decreases a bit with time. Simple washing didn't help mine, or at least not enough. I scrubbed it with dish soap and an old toothbrush and it went back to like-new, though.