I'm sure this isn't new to a lot of you out there but to me I've never seen them before and I think they're GREAT! I don't use a jigsaw often because I've never liked results I got. Not until I bought a package of Bosch blades. They cut through wood like a hot knife through butter! I have more control now because I can operate the jigsaw at a lower speed and still have fast clean cuts. I've been cutting 3/4" ply, solid stock, and 1/8" veneer with hardly any rough edges and most of the time smooth as a... well you know. I might just use my jigsaw a little more now.