I have a set for my bike too. They're OK, - kind of a pain to get mounted right, - on my bike at least.

There are a couple of pieces of felt mounted where the strut meets the fender near the braking surface of the rim. The felt will occasionally rub against the rim and that is intentional. It's supposed to center the fender. If you ride when it's wet (sort of the idea behind a fender) and you get some vegetation or something stuck on the inside of the fender it will rub. Happens fairly often.

There's a front fender too if you look closely.

They are almost invisible from a distance. During the beginning of a group ride another guy tucked in behind me and kind of freaked out. The fender was moving a little from side to side. He thought it was my wheel at first.

I think SKS has come out with an extended version of their race blades that I may try someday.

I have them off for the summer but this is what my bike looks like with them on: