Shimano's new Dura Ace 9000 got a lot of press for a lot of reasons: the jump to 11 speed, the gorgeous design, the new lever ergonomics, but perhaps more than anything for the crankset and its all new, four arm spider. It's great to look at, but what's so great about a proprietary and heretofore secret BCD No need to buy a compact crankset. With the Dura Ace 9000 crankset, you can run anything from a 50 34 combo to a 55 42 just by swapping chainrings and moving your derailleur probably swapping chains, too. Effectively, this means your bike can be a TT ride one weekend, and a hill climb champ the next. It's a little more work, but if you're a privateer racer, or an enthusiast on a budget, it makes a lot of sense.