I originally got this frame for a fixed / singlespeed project I had with custom laced Zipp 404 carbon tubular wheels. I then had a vision of a fast roadie with only 6 gears like a sports car and a paddle shifter to control.
I scored a set of wheels from Real Designs which is a partner with Litespeed (providing them with their carbon forks, wheels) and then went to work on a custom 6speed gear setup using a Shimano Dura Ace 9 speed cassette. I used a SRAM Force rear derailleur which is designed for 10 speed but I modded using longer stop screws to work for 6 gears and not running the chain off the freewheel over shifting. Up front is a SRAM Force carbon crank with a single 48 tooth chainring, gearing is two gears for climbing, three for flat and one for downhill.
My next favorite part is the use of a SRAM time trial bar end shifter (shown on the end of the handlebars on the right sid) to control the shifting, acting like a paddle shifter on a sports car. The bike is built reliable with carbon clincher tires for easy changes and weights in at 16 pounds. It spins up quick and shifts on a dime.