Join Date: Apr 2005
Location: Brownsville, TX
Bikes: Surly CC
I don't know about the 23c issues you might face, but I rode a hybrid with them for about 6 months without any issues, and I'm a big boy (was 250 at the time).
My Vaya has a set of 40cs on it and I can say that it doesn't ride better because of them, it just means I'm pushing a lot more tire than needed for the job. I'm going back down to a set of 28c on Monday and keeping the 40c for gravel grinding only.
I think a 28 is probably the magic number most people will agree on because its a compromise of low rolling resistance with a lower pressure tire. A 23 is going to feel fast, but sketchy for someone my size (I'm currently at 215 again). When I was heavier, I was more careful about how aggressive I road.