I have been using SRAM for a little over a year now. I have no intentions of ever going back to Shimano. I'll stick to SRAM and their 1:1 ratio, it just works. Since switching ghost shifting is just a bad memory. The only Shimano I will use is their cassette's and front derailleurs. Once SRAM loses some weight on those two components I'll be able to go 100% SRAM.
Oh, I don't use any Shimano on my roadies either, they are both campy equiped.
