Depends on how your motor's running, and how you're riding... I have three road bikes, one with a triple (53/42/30 by 12-25 9-speed cogset) which is my main touring all-round riding bike; one with a 53/39 12-25 9-speed cassette, which is sort of a spare, but is fast as all get-out) and a new one, with a 50/34 10-speed compact double. Took a little getting used to in not having the 42 ring and using the granny gear only on the real bad hills, but I like the compact every bit as much as I do my old triple-ringed Trek. New bike has been getting the miles lately in an effeort to get used to it, and it's destined to be my racer/fast bike.

Best advice is to try one, and see how it suits your riding style.