The RCBS press-mounted primer pocket swager works very well and there are no ruined cases to deal with in the learning stage. Speed of operation looks to be about the same as the drill press method, but results are uniform with the RCBS unit.

I've read criticisms of the RCBS product on this forum and others. After reading a few of these, it becomes quite obvious that most complaints stem from improper tool adjustment. A little under and the crimp won't be entirely removed, a little over and the guide rod may bend.

Perfect adjustment takes some patience and trial and error, but once properly set, it needn't be adjusted again. Mine is probably a '60s unit that I bought used, years ago. One of the two rods that came with it was bent; RCBS replaced it. Works fine and isn't nearly as slow as some claim.