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I ride with the sk version (32mm) on my Pacer. Have no problems keeping up on my Saturday morning rides with a group, we average about 18mph, so not a fast pace. They aren't as smooth running as the file tread version, but last a hell of a lot longer, and don't cut up as easily, great for nipping off the beaten track as well.
Depending what width you're looking at, also consider Specialized Roubaix Pro, had the 30/32 tubed version, rather nice tyres.
is there a consensus preference between gravelking SK and non-SK versions? do the SK versions still roll well enough for winter club rides? they're a little heavier. are the non-SK versions actually decent on gravel? seem slick