I've been buying the Calphalon Non Stick frying pans for several years now. I usually snag the two packs when they are on sale during the holidays.
While they seem to hold up pretty well, once thing I've always noticed about mine is they quickly start to lose their non-stick properties. They'll work great at first, but within a few months things like omelettes will start sticking to them.
I only use pure oil or butter, no sprays in a can as I heard the additives can leave residue on your non stick pans. I also only use silicon or wood utensils in them. I do wash them in the dishwasher regularly if that has anything to do with it.
I have some cheaper off brand spare non stick frying pans, and it seem like they are working better these days than the Calphalons are.