I'm also at 100+ miles. My commute is 28.8 mi and I end up using 60% or so of the 17.4 Ah pack, riding probably at an average of 23 MPH with one or two steep hills (the rest flat). Performance is great and the bike is very fast. My motor does make some funny noises that I'm not sure are normal but other than that it's a great bike.
23 mph will eat up your pack pretty quick, but when time is of the essence, I guess you've little choice. I ride in eco mode most of the time & use the
gears, but once in a while I can't resist the urge to hit sport mode & smoke road bike riders on carbons that cost just as much. My DIY inframe obscures
the 21ah pack & my panniers hide the motor. Makes me smile to see the bewildered looks on riders a 1/3 my age. :0)
Also: My motor makes a bit of noise when loaded up; that just tells me I need a lower gear.