No problem. I ride with some Yamaha FJR's and I can kinda sorta keep up with them... but they have 145 hp.

No problem at all with the Harleys. My 06 Speedy likes to cruise around 75-85..but she ain't really broken in yet... only 3000 miles.
Same cruising speed as my Harley Softail Deuce (very little vibration), and that's just getting nicely broke in...only 30,000 miles.
The only time my Triumph vibrates is when the carbs need synced. So far only once at the 500 miles checkup. Otherwise, nice and smooth.
I like the SpeedMaster cuase it has a tach. When I'm running with the Harleys I can't hear the engine to shift gears, even with my "off road" pipes...

Mary