Tenacious,
I thought I would let you know that I just installed my SKS p50 fenders. I installed them on my Surly Long Haul with 700c tires. They installed easy but still took me a while to figure out what to do for I had no experience with fenders before. I went slower because I just wanted to make sure I did not mess anything up getting ahead of the game.
Anyway, the on product looks nice and the little riding I did, they did not make any rattling sound and gave good clearance for the tires.