I used to use RawShooter Premium, but since I updated Adobe CameraRaw to version 3 and higher, I tend to like the latter more.
The workflow in RSP is better, but I found mself still adjusting levels/curves in Photoshop. The conversions in ACR are such that I only need curves for special effects or some local adjustments.
It appears that (some) rawshooter technology is incorporated in Lightroom, so we get the best of both worlds
I think there are no really bad raw converters. It is more whether you are happy with the results and the ease of use. Maybe some converters are biased to landscapes and other to skintones and there is where your choise could be.