Which Groupset?

^ what he said, I have 105 on my cannondale caad, defiantly reliable and I have swapped the original brake pads with swisstop greens the day I got the bike. Brakes absolutely fine. I had Ultegra 6700 prior to this which seemed better (smooth gear shift/braking etc) but the main reason for that would be gore tex sealed cables.

Or the fact that Ultegra is just better than 105?! Ultegra is effectively 95% of the performance/weight of Dura Ace, at 60% of the price