I strongly recommend using the Garneau one. I have been doing so for several years, and have gone though three or more of them. They don't wear out, but they get stained and sketchy looking. I haven't tried the Nashbar one. I like the look from an aesthetic standpoint, but I consider the high visibility of the Garneau one essential.

I generally leave it on all the time, year round, but I do take it off occasionally when it's really hot out.