I ruined a few dozen cases with the Dillon before I figured it out. Since then I've swaged thousands of cases without a problem - and without having to change adjustments.

IMO you have to learn the feel of the Dillon. Kind of like priming on a 550B.

But I hate ANY kind of case prep so I got an 1050 and RT1200. Now the SS600 only gets pulled out for the occasional crimped 7.62.
Also - the Dillon can be fairly fast:

http://www.youtube.com/watch?v=k2EyE-HAv3I