I ordered a 26" front 250W Pro kit on Monday - everything arrived two days later. Last night I fitted it to my wife's bike. No real issues with the kit, more with the cheap mountain bike!
Had to put washers on the axle to space the forks away from the motor, the casing was rubbing.
PAS sensor wobbled all over the place. Put a cable tie round the shaft to keep it pushed against the pedal crank.
Loads of excess cable from the motor and handlebar looms. That's not a criticism
Motor rotates the wrong way with the cable coming out the left side, so will have to cut my cable ties, flip it over and run the cable up the right side fork.
I don't yet have a lithium battery (couldn't afford £200 for the kit and £200 for a battery in the same month), so currently have three 5Ah sealed lead acids on a rear rack. Heavy and not high capacity but they'll do for testing until I get a 10Ah lithium.
Tonight I'll take it out for the first test ride - with the wheel turning the right way