I have a set of the Zipp classic track hubs and I love them. I bought them second hand about 4 years ago. For a bit there I was unaware of what I had and I delivered on them for a couple and then used the back hub on a crappy GT hybrid for my wife. I treated them like hell and they still roll as smooth as glass. I don't really think that they are worth the 450 for the pair but then again I am not you.