I REALLY like these Clement LAS tires. Apparently they are actually made by Tufo however to a design by Clement, so they have a bit larger side knobs than the Tufo Dry tires. Rolling resistance seems quite low, and although they are obviously heavier than road tubulars, it is amazing how well they go on the road. I raced Battenkill on them after a night of rain, and although I was quite out of shape I could fly by those around me on all the dirt sections. Then I could rest a bit until the group I was with caught back up on pavement. The tires were a big advantage overall and saved me a lot energy on those dirt sections. The only downside for CX racing is that the temptation to use them when you really should be on mud or all-round tires is often irresistible. Best to save them for the obvious dry/fast conditions.