I have a pair on the front of the Prius my son is now driving. Been on for almost 10k miles, and though I'm sure they've worn (obviously), it's not yet visually noticeable.
Note: I bought this pair as an emergency measure after striking a curb up in Atlanta, which blew one of the Michelins. I needed to get on the road ASAP, and these were the only ones in stock. Hey, so far, I'm impressed, especially for the price.