Just my $.02
Over the past 4 seasons I've gone from 9-spd 12-25 with 39x53 standard to 10-spd 11-28 with compact 34x50. I liked the low gearing for early season, but didn't really need it once I'd gotten some miles under my belt, and felt like there wasn't enough high end. I recently installed some Praxis 36x52 chainrings, and an 11-25 cassette. Have yet to ride it, but figure the 36x25 is lower than my former 39x25 low, and the 52x11 should be plenty high enough for my needs.
Compact looked good on paper, but just didn't do it for me IRL, and standard 39x53 was just a little too tall with the max 27T (I think) rear I could run with 9-speed.
On 2nd thought, I think I had cobbled a 9-spd 11-23 together with a 9-spd 12-25 to create a 11-25, which worked pretty well with the 39x53. I went to compact after ACL surgery, thinking the lower gearing would cause less strain on the knee, but immediately missed the 53x11 high gear on descents.
The Roubaix I bought at the end of 2013 came with 10-speed, and it's only taken me two years to nail down my gearing options.
Edited by MT Skull - 5/9/15 at 7:49am