My two main commuter bikes have SKS P45 fenders covering 700-35 tires. I added the PB Cascadia long mud flaps to the front fenders of both to add extra coverage. This keeps the front tire from throwing a lot of dirt and sand into the front chainring. The main reason I leave fenders on my bikes year round here in the arid climate zone of Orange County, CA is to keep dirt out of the chain and off my bike. I commute 5 days a week, about 29 miles a day. It makes a big difference if I leave fenders on the bike because otherwise the chain would get coated with grit in just a few days. I can ride 2 or 3 weeks between chain cleanings with fenders and flaps. The front fender also keeps dirt out of the lower headset. I have never cleaned or adjusted the headset on my Rivendell Atlantis, and it has gone well over 20k miles.

I agree, the velo orange fenders look great. I might try them the next time I need fenders, but the 6 year old SKS on my Atlantis look just fine.