That's pretty cool. Nice for large productions, I'd suppose. But I like to be meticulous and take great care when I'm trimming my buds... Yea, it takes a long time, but I only harvest once every 12-15 days, so if it takes two or three hours, that's not too much of a sacrifice. Especially since I keep my trimmings too, to make hash and butter from them...
Scissors every time, if i don't, i just spend the time saved manicuring the bud prior to actually smoking it. Might as well just do it right the first time.