I cannot answer the original question, but I do use the campy shifters. Just about 2 months ago, I finally switched from bar-ends to brifters on my single road bike. I went with campy centaurs. I use a 9 speed shimano hub with a 10 speed campy shifter.
http://cxmagazine.com/shimano-campag...-compatibility
It works great. I love the campy setup. Being able to shift multiple speeds at a time and routing all the cables under the bar tape is fantastic. I originally wondered about the whole thumb button thing, but that is one of the best parts. It is incredibly easy to upshift while accellerating. So, I recently got a Cannondale road tandem that came with 9 speed Tiagra's. Wow, those did not compare. I can't speak to the comparison to ultegra, but I quickly found some Centaurs for really cheap and replaced them. Just like the road bike, the tandem now has 10 speed campy centaurs, with a 9 speed shimano hub, and it works flawlessly.