Both of my bikes have a compact double, they are both 50-34 in the front and my road bike is 11-28 and my tri-bike is 11-25.

I have been ridding the compact doubles for about 6 years, I ride in fairly hilly terrian and when I had the triple almost never used the lowest gears. I tended to ride 80% of the time in the largest cog and go to the middle for hills. I still ride most of the time in the large cog and only switch to the smaller cog for steep or longer hills.

I actually find the double much smoother and easier to use than the triple and with the 11-28 I really don't think you lose much from a standard triple.