Currently using the Velbon Carmagne 530 carbon fibre tripod legs. Love the weight (or lack of it). For me, it's the first tripod that I've actually wanted to carry around with me.
No real experience with other carbon fibre tripods but I did make some brief in-store comparison with several Gitzo and Manfrotto models. Decided on the Velbon legs in the end. I'm not usually impressed with Velbons but their carbon fibre models are something else.
Have been happy with mine so far.
Wish it didn't cost so much, but then again all the carbon ones do...
The Velbon Carmagne 630 (3 sections) or 640 (4 sections) can be bought from Alley Photo for S$599. A "Stone Bag" is included: this is the triangular pouch that you can attached between the legs to weigh down the tripod in windy condition. A very nice original Velbon tripod strap is also thrown in as "Free gift". You can check out the site www.alleyphoto.com.