Good information in this thread everyone.
Just wanted to chime in and say the girlfriend and I both got an FX2/FX3 disc 2 years ago and we ride them a few times a week, definitely love them. I am in the midst of switching the seat and grips out though as longer rides are getting uncomfortable for me.
I converted both bikes with a BBS02 kit and 52v battery. If anyone has any questions about the conversion on the FX's let me know, I would be glad to help. Right now we are getting 100-120km per charge on a 52v 14ah battery running 25-30km/h and it has been windy! They are well balanced bikes for an electric conversion.