I really liked (still like?) RSP, but I find myself getting farther away from still using it, knowing it will not be updated, but then again, should I care? I tried Bibble and tried to like it, but it didn't cut it with this RSP users. Tried Lightroom, and I like it, but right now in beta, it is a bit slow and the user interface needs some work. It does a lot of stuff, and that isn't necessarily a good thing.
I find that I am going back to DPP2.1 more and more, and since I still shoot an old model Canon, features in DPP that are on the newer bodies, actually work in the software on my older camera. And sometimes DPP just makes a better conversion than RSP does.