I have a 650 and overall I have been pleased, but as others here have mentioned, especially on 8-ply mat board, I notice bowing in my cuts. I'm tempted to get one of those 850s linked to earlier here, but no justification for it right now (no cash, no need... I haven't been shooting and showing as much lately). But it would be nice to be able to start matting in 8-ply again and not have to waste so much board to get a good window.