I'm a user and like the DxO sharpening, leaving the other shrpening features unchecked, DxO lighting and geometry. I agree it's a great RAW converter I use the Pentax PEF format. Sometimes I finish in Cs2. Most times not.
The white balance adjustment is easy to use, for my style. The color-picker is harder, but fun to play with with some shots that need it.
OFF topic - I j-u-s-t recently found out how to debug the back-focus issue with my Pentax * lens..dang what a difference as I was this close to pitching it) K10D and 16-50 2.8 lens.