I've owned carbon bikes and a Lynskey Ti.

The Lynskey was comfortable and surprisingly fast - some of my fastest rides have been on it. However, I found the ride quality a little boring. You know when you stomp on the pedals and the bike surges forward? That seemed to be muted with Ti - it would often seem as though the brakes were rubbing or the BB was flexing. Note: it merely SEEMED that way. In actual performance, the bike rode really well. But perceived or not, I preferred the ride quality of carbon and sold the Ti bike.