Bought this new 77mm CPL from Adorama in late May for a trip, used it on my new Tokina 11-16 and was very pleased with the results - NO vignetting (which was happening with Hoya's thicker filters). I am VERY careful with my cams. I'd throw myself in front of a bus to save tis thing. Bottom line - I don't bang it on walls, chairs, or even sit it down hard. Have used this lens/filter combo exactly one more time (in my house, no less) since this trip in early June. When I removed it from the drawer today, splinter crack emanating from what looks like a spot a few mm from the edge (but still under the metal frame). Basically three-pronged crack that is making its way across the entire diameter of the filter. I suppose I can call Adorama and beg, but I mentioned this to a friend who's an amateur photog and she said, "Yeah, they're not the best quality." WTH. I hope she was just spouting nonsense, because I didn't pay $200 for poor quality. Been using Hoya's (thicker) filters for years without incident. Anyone ever heard of thesse things spontaneously or easily cracking? I know it was fine when I put it away a couple of weeks ago, and this area is so temp-controlled, it's not even funny. I know I didn't bang it weeks ago only to have it crack now, because nobody touches that cam but me, and I handle it pretty gently.