i ride the ruby comp and I love, love, love it. The smootheness of riding full carbon after 10 years on an aluminum frame is just heavenly. Since I went from riding a hybrid the 105 was a huge improvement for me and I did not feel the need to upgrade to ultegra or dura ace. Since I have done mainly tri training and not straight biking I have fewer miles in than you are describing - probably only 800-1000 (I was really focusing on my run this year) but have no problems, except when I wear tri shorts (very little padding). In normal bike shorts - mainly shebeest triple s - I am a happy camper with the stock saddle. The compact double also served me well, as we don't have much in the way of hills around here.
Brina
"Truth goes through three stages: first it is ridiculed; then violently opposed; finally, it’s accepted as being self-evident." Schopenhauer