Would be interested in some feedback regarding performance and distance achievable on battery when you have it delivered, fitted and in use.
The "Swytch" kit arrived yesterday, it was fairly easy to fit although I did have to modify a plastic sensor to fit my Carrera Crossfire but it was not too difficult.
The powerpack came fully charged and just clips onto the handlebar, I bought the more powerful 50 mile range pack as they where out of stock of the lower powered one which would have sufficed for the amount of cycling I do.
Just taken it out for a short run of 5 miles, with setting 0, no assist, the bike rode as normal although I was aware of the extra 3kg of the battery on the handlebar, at setting no 1 you could feel a slight pull from the bike.
Coming to a short but steepish hill where I normally struggle near the top I switched to setting 9, the highest, only had to go through the motion of turning the pedals to get me to the top.
No idea about distance achievable as it may take me some time to get to the advertised 50 miles but that is dependent on the settings you run at, I would not expect to achieve that if you ran on 9 all the time, indecently on 9 it took me up to 20mph before it cut of.
I would expect to use No. 3 setting most of time, maybe 5 with a headwind but would wind it up to 9 for hills, the motor takes a couple of seconds to kick in once you start peddling and ramps up to the speed you set so no jolt.