As 'grafixjoe' said the manual is a real big help, espacially for understanding the interface and practice as said before is essential. The results are fantastic. Don't expect real time results. SA Color Finesse is the cheap, professional way for color correction, but it requires a lot of rendering time. We did several productions which completely were color corrected with Color Finesse, and everybody was happy at the end.
Andreas
P.S. If you're from Munich (germany) you can contact me offlist with german questions.