The 270/90 firing order makes the Beemer sound more like a V-Twin than a typical, sterile parallel twin with a 360 degree crank. I noticed the difference when jumping off my TMAX onto the C650GT. I think the C650GT sounds BETTER, the TMAX engine, though sporty enough, had a boring, droning tone.
As for vibration, there was a high-frequency tingle that came and went on the TMAX that could be felt in your hands, feet and butt. On the C650GT, it is a far less annoying low frequency rumble that I really only feel in my hands.
There is ONE thing Yamaha got right with the TMAX, though. The mirrors on the C650GT give you a great view of the lanes on either side of you and your upper arms. What is directly behind you (like the LEO with flashing lights) is completely obstructed from view. The long, hated, insect-antenna like mirrors on the TMAX gave you a good view of EVERYTHING behind you. I wish the Beemer's mirrors were as good.