I had my LBS switch out my 52/42 to an FSA 50/34 on my 20 year old Trek with Shimano downtube shifters, rear is 12-28 six speed. On my new bike, Seven, I put Campy 50/34 with 13-29 in the rear. I do lots of hills, don't race, 51 yrs old. I tried a triple, but really did not like it, too many gears to think about,mushy shifting. I''m sure I lose a little off the top end, but that's not my concern. Getting up the hill is my issue, I can always get down. I really like both setups. I've set them up so the gearing is as low as possible with a double and it gives me lots of confidence in the hills. (Last weekend I did a 1000 foot climb over just 4 miles on the Trek, although it was a tough climb for me, I made it. I don't think I could have done it with the 42.) Anyway, for what it's worth I think compact is the way to go, so long as you're willing to give up a little on the top end.