My apologies if this has been debated before, but I haven't been to the forum in a few months. My question -- do you prefer a folder with a thumb hole or a thumb stud? I own a few of each and immensely prefer the hole on my Spydercos. It seems to open much easier than any studded blades I've tried. As a follow-up question -- the thumb hole is such a great innovation, why hasn't everyone copied it? I've heard Spyderco has a patent on the thumb hole, but can you patent a hole?