Depends on the terrain. For flat circuits I moved from compact 50/34 to 53/39 on 11-23 (I had to buy new parts so went for it) but there is no reason you'll run out of gears with 50x11 unless you have the mother of all sprints.
@ 100 RPM you'll still be doing 35.6mph with a 50x11.
Monty Dog wrote:
I race with a compact chainset - generally stays in the 50 ring for the whole race, hills and all, my view being that if I can't turn the gear then I'm simply not strong/fit enough to race. Likewise, if you can't do the climbs on the big ring you're probably going to be dropped anyway. Most of my local races finish with a slight uphill, so 11 sprocket is rarely needs.