good writeup for those that are confused about the pros/cons, thanks for contributing!!!
its worth noting that the usage of CFS alone isnt what causes the gps (or other app) troubles... specifically in the battery tweak, there is a 'CFS Tweak' that causes the CFS kernel to act like the bfs kernel (google: no_new_fair_sleepers for more info as thats what the batt-tweak cfs-tweak does)
this is what may cause the gps troubles
"Software is like sex: it's better when it's free." Linus Torvalds