Buy these if you are looking to set them up tubeless, on a tubeless ready rim, but nothing else. These tires have been tough to work with. I've tried to set them up tubeless on a Ksyrium SL but it seems the bead is so tight that it pulls the tire down into the rim bed, preventing it from maintaining a solid seat to the rim. Even with a tube, the tire is so tight to the Ksyrium, it doesnt seat up straight, not to mention that it is extremely tough to mount and remove. I am currently using this tire on a Mavic Open pro rim with a tube, and it seems be working fine, but running a tubeless setup has been less than successful endeavor for me. Training tire, Yes
Racing tire, No (go with a tubular + sealant)