I've got the FSA compacts and Easton EC90 SLX3 carbon bars. I like them both for different purposes. Generally, the FSAs for relative flat terrain, the EC90 where there's lots of climbing. Couple points.

1. Carbon bars do provide vibration dampening. My Synapse had a low freq vibe and the carbon bars eliminated it and I even use Fizik Microtex tape on them with no gloves. On the Supersix, let me put it this way. If heaven had SRAM Red shifters on it these bars would be that place.

2. The pros don't use carbon bars because they know a crash is possible and they don't want to be stuck on the side of the road with a broken bar waiting for the team car.

3. If you're going carbon get a torque wrench and some compound when mounting.

4. +1 on Ebay. You can get them for 1/2 retail. GL