In terms of vibration, my carbon bars have slightly less vibrations than the alloy handlebars that came with my carbon bike. But, yes, there are still vibrations on the handlebars on chip seal roads.

Just be forewarned, that if you crash, the carbon handlebars break and do not bend like alloy/aluminum bars.

Maybe my handlebars would be even better at blocking vibration if I had a bike like the Ruby with the Zertz inserts?
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle