The problem with the external controller version for the end users that I have seen is that its "wires everywhere"
What GM should do is build an aluminium box that fits onto the bike rack, external controller inside ( with aluminium the case will cool the controller) and have all the internal connections go to 1 connector, much like the connector at the wheel end...that way its just 1 connector at each end of the bike....
Personally I don't see MP3 solving the problems for GM....The MP2's that worked, worked fine, but clearly manufacturing quality and QC have conspired against it.....and if MP3 is manufactured by the same partners etc.....
But don't get me wrong, fingers crossed....
Gary,. I hear it will be available in 2 weeks lol ( gary bounces back from unbreakable polycarbonate window with confused look)