I love my Xikar xi2, carry it with me everywhere. (Lost one that way; in Belize, forgot it was in the pocket of my swim trunks.)

My Colibri (sign-up gift from CRA) looks nice but doesn't work nearly as well for me; might be something I'm doing wrong, but I just can't get it to cut cleanly.

I also have and use several of the cheaper double-guillotine cutters; roughly one for every working ashtray (including the car), lying right next to a Bic. (Yeah, I have torches too -- one in my pocket with the Xikar, another at my desk, one that "floats"from ashtray to ashtray.)

Single-guillotine cutters work, but I usually consider them disposable or giveaway items. Any double-guillotine (except maybe my Colibri) works better for me.

Maybe someday I'll buy a "top of the line" Xikar or something of similar quality as my coffee table's resident cutter. A fancy pair of cigar scissors might be nice too. But for now, I'd rather spend my money on cigars themselves; priorities, y'know.