I tried out RAWstudio a couple times through the past year or so. I had to try it, because I knew how much time it could conceivably save me. Both times, though, the image quality of the output JPG was horrible in comparison to UFRaw. So, it would save time, but my photos looked nasty.
Then, I noticed some slick JPG output on the MeetTheGIMP videocast when Rolf (the host) gave RAWstudio a test run. It looked so much better than mine. What was I doing wrong? So, I decided I would give it another try, and I am glad I did.