I'm actually kinda surprised that this one didn't sell out really quickly. Maybe it's because we all know how useful it is, and so we've all bought it already!
The Round Tab Punch is so useful for all sorts of things. Here's an Ideas Sheet I put together for it (quite a few years ago now...remember Mr Crabby??)
The main thing I use mine for these days is do make tabs for my catalogues. It helps me find the section I am after really quickly. My daughter pinches it on occasion to do the same thing for her school books and assignments. This is one punch that I think I'll be hanging on to!