I have Klein Quantam Carbon compact which is what the Aura was orginally named. I have to say it is
probably my favorite bike. I bought it as a short term replacement after I crashed and basically broke
my almost brand new custom Seven Axiom in half. I immediately liked it better than my Seven or the
other bikes I have owned. These bikes include a Trek 2300 and Litespeed Tuscany.

It has survived one hard crash and I have about 10,000 miles on it. I hate to admit it but I still probably like it better than my full Dura-Ace tricked out Cervelo Soloist which I bought with insurance money from the Seven I crashed. Bear in mind the Klein has only a 105/Tiagara mix, It was the bottom of the line bike Klein had at the time.

So I guess all in all I recommend highly.