I actually rode around on this (not my bike) and I absolutely HATED it. The owner was not super thrilled as well because it needed to be tweaked frequently to be running optimally.

Things I did/do like about SR11 is that the brake lever actuation is the best I have ever felt from any manufacturer. Also, the crank as well as brake calipers looks really nice in my opinion.

If I lived somewhere with real mountains, and not the hill we call Bear Mountain, I might see how SR11 would be convenient, since it can shift down more than 2 cogs at a time.

However, Di2 basically solves any and all of these issues, be it cable routing, cable pull ratio, shifting under load, cross chaining, etc.