I used to have a 52/39 chainset on my Ridgeback Genesis flat-barred fast commuter. The main thing I didn't like about it, at first, was that the LH gear indicator showed three gears, but I only had two. Later on I changed the flat bars for drops, and put Tiagra gear/brake levers on it. I found that I very rarely used the top gears, but often found myself struggling up hills in the bottom gear. I took the bike in to have a triple chainset, but by the time they quoted me for the new chainset, bottom bracket, front derailleur and back derailleur, I thought better of it. Later on I changed to a 50/36 compact. This seems pretty good. The 36 chainring seems small enough to get up most hills. A lot of triples look a bit naff, although there are some about where the inner ring is only a bit smaller than the middle ring and they look alright. If I was to put on a triple chainset, I would probably choose a very tight cassette, because the combination of a granny ring and dinner plate sprockets would make the bottom gears ridiculously small.