Update: 2017 Milwaukee 8:
Holy crap!!!! That is one faaaaasst motor! I did a test ride for about 15 miles today on freeway and thru suburbs. This power plant is going to wear out rear tires fast. The torque comes on immediately, forget about the traditional power curve. I even took it down to 25mph in 5th gear w/o any lugging or bucking whatsoever. I could not believe how incredibly powerful this engine is. It was a 91 degree day and any thoughts of hot right thigh never crossed my mind on this non water cooled version.
Some observations though:
The top end motor noise was non existent. The valve train was quiet, the engine seems to run cooler and the stock pipes sounded "traditional" Harley although I couldn't discern the Potata-potata lope at idle which is now 850rpm, down from 1100 on previous motors.
There was very little shake or vibration in the bars but I could feel it coming from the frame up thru the seat and wondered if that would be a problem on a long day in the saddle.
The shift "clunk" was missing in this bike, it was a very solid engagement thru all the gears. Don't get me wrong-you could still hear it engage just not with the traditional "Harley Clunk" we've all come to know.
My current 2014 puts out about 86 HP but it would be no match for this power plant. IF . . . . . I were to buy one of these I doubt I'd do any mods to the engine for my needs but I can only imagine what potential this engine has. Shame they didn't do a few more practical (inexpensive) improvements too like LED lighting all the way around and stop/brake light in the bottom louver fender light for safety and visibility.
If i were grading the 2017 Milwaukee eight on a scale of 1 to 10, I would have to give it a 13-14 !