I just wanted to add to this thread and thank everyone on it for all the great info. Based on advise found here (and directly in contradiction to other advice found on ES) I went ahead and converted my 22# (20 speed) aluminum cyclocross bike with a BMS Q100cst 328rpm 36V kit.
My goal was a PAS setup that helped rather than replaced my pedaling. The BMS kit I purchased consisted of:
Q100cst 328rpm 32 hole motor custom built up in the US with a decent DT Swiss disc rim
36V s06 sinewave controller integrated into new bottle case
36V 11.6 Ah panasonic bottle battery
12 position left side hall effect PAS sensor
Q100cst 328 32 hole motor custom built up in the US with a decent DT Swiss disc rim
two chargers (one for the office/one for home)
no brake switch (drop bars and hydraulic brakes)...I have found I don't see a need for the brake kill switch
throttle and controller are placed on an out front carbon bar from Amazon, though I have only used the throttle for testing and setup. I had done a lot of searching for throttle options since the throttles are too small to fit on drop bars and happy with the solution I came up with.
My daily ride consists of a 14 mile commute each way with 10 miles of rail-to-trail bike path. Decent climb/decent at one end depending on direction.
My times pre-electric had me averaging 20 on the flats on my road bike, more like 18 on the cross bike.
Now with the ebike setup I can average 24 at pas level 5, 22 at pas level 4, 20 at pas level 3. Dead silent motor.
I have been turning the PAS down to 1 for the climb, and tend to do the whole climb standing (trying to put a lot more human power rather then ebike into the climb).
I can make it both ways on a single charge at 4-5 PAS.
Glad I went with the 328rpm as the 201 would have been too slow and the 260 would have meant sacrificing the 10 speed rear cassette.
thanks again!