Did you get the pair off ebay with the velocity stickers on? How much did they go for in the end?

I just got some and really like them, they come with 16t and 15t sprokets.

Can't say much about their durability yet, but they have been fine over two weeks of londons finest pot holes with 13 &1/2 stone and a metric tonne of biachi pista frame on top, give me 23&1/2 months and I'll let you know how they hold up to 2 years abuse.