Wow, holy moly. Just got this yesterday, mounted it up, and it is absolutely amazing. I put it on a big floor-standing Delta drill press that had a stock 5/8 inch keyed chuck that was OK but nothing special. Kind of clunky in retrospect. The addition of this keyless chuck turns the drill press into a surgically-precise instrument. Man o man. I use a lot of fine bits for lutherie work, and this chuck is absolutely perfect down to the tinyest bits I use. Indescribably better than the stock chuck. As well as being spectacular from a functional standpoint, it is gorgeous. I agree with another review... it is a bit "stiff", but I think that is the flip side of it being so precisely machined. I just flip up the housing cover for the drill press pulleys, and hold the front pulley spindle while I twist the chuck. I usually back-twist that pulley stack to speed up chuck settings anyway... I did that for my stock chuck. So no biggie. Can't say enough good stuff about this chuck. I got it on sale, after a discussion with a helpful tech support guy. SO glad I didn't get the cheaper one. Now I wish I would have gotten this a couple years ago, not even on sale.