This crank is well worth the money. I upgraded my 2010 Allez from Spec. from a S-series crank to this one to make a complete apex group-o and it works great. Smooth pedaling, lighter, and spins up quicker. I got the 50-34 172.5 crank, for my Large 56 frame and it works great. I already put about 50 miles on it and its doing great. I swaped out the threded 30BB for the GXP and it feels solid. The chain rings are a tad bit sharp compared to the previous crank, so if your not paying attention they will tattoo you.