I also switched to SRAM RD with Campy shifters. I would rate the shifting 9 out of 10. It will sometimes shift two gears instead of one in the middle of the cassette. The odd thing is that it puts the jockey pully directly under each rear cog all across the cassette. To me it seems like the RD is too flexible. We put a lot of stress on a RD by sometimes shifting when standing and the performance there is well below what I would like.
Previously we used either Shimano XTR or Campy Centaur triple RD with the appropriate Jtek and Campy shifters on our tandems. They shift 10 out of 10 when adjusted but would loose adjustment as the Jtek rotated out of adjustment. When adjusted, shifting up or down when out of the saddle was great. Really great shifting. It was the constant problems with JTEK adjustment that caused the move to a SRAM RD. Sometimes I had to adjust it in the middle of a long ride while the SRAM stays adjusted even if the shifting is not perfect. Basically I have learned to work with it. I have found that a freshly lubricated chain helps the SRAM shift better. Part of my SRAM coping strategy is to lubricate the chain often.
I am considering attempting to modify a JTEK to clamp the cable to the pully so that it will not slip and lose adjustment. Electronic is not an option for us because we want a triple. I also like the shape of the Campy 10 shifters and would hesitate to switch to a larger Shimano shape shifter.