I made the switch (on Ultegra 9) with some anxiety about 3-4 years ago and was glad of it. I was tickled a few years later to see compacts become standard - even on higher end bikes. I now have a 50/34 and 11/25, and since I don't like cross chaining at all (I leave two cogs unused on each end), having an 11 on the back allows me to go to 34-13 and maintain 20-21 comfortably. The only time I ever see the 50 is with a BIG tailwind or long downhill - strict recreational guy here.