Generally love it. Fit to bike was doable, but required being clever. Mine has worked just fine, not perfect. Range (even along the exact route with similar conditions) is variable. Affect of motor drag at end of output is a bummer - SO much resistance, rediculous. Hate that. Odometer has twice now randomly reset to zero (at just above 600 miles). I find the fact that the battery itself has one set of charge lights that don't corroborate with control battery gage annoying. Little battery indicator is wild and goes from 2 to 1 then to 2 to 3, very annoying. These are the bits that riders need to have a good commute. I wish that when you pedal faster than the assist limit, that the thing would just chill and not add resistance. When I'm jamming I feel like I am cranking against the motor like a spin bike. boo.