I looked at Ebikes from many different places and read a lot about them in reviews and forums and I ended up buying a conversion for my proven Trek. I bought a 36 volt 13AH 500 watt motor and I am so satisfied with what I got except I wish I would have gotten the 17 AH for more range. I put the kit myself on the bike which took me about 5 hours and the cost was about $1000.00. I purchased it from Ebikebc and they are great people to deal with. I have had the conversion for two weeks and cannot wait till my next riding cycle.