My buyer's remorse is for every CRKT and Cold Steel knife I have ever bought.
The CRKTs were all cheap - not much money lost (per knife, at least), but not much value had, either. Sometimes interesting designs from various custom makers, but put together with poor materials and poor fit-and-finish. They are just bad knives, in my opinion.
The Cold Steel knives were all fine, I guess, but not to my design taste at all. A little too big, too blocky, blade too thick, not what I would want. I'm not surprised that other people like these - they're just not for me.
Oh, well, lessons learned, I guess.
-Tyson