As many of us are awaiting arrival of xm-3500Li with ThunderSky Lithium Iron Phospate batteries, theres some diverse discussion going on over at EVDL discussion list over this brand of batteries (over 41 responses and counting!).
I'm sure the xm-3500Li early adopters will be able to weigh in on this discussion here sooner than later - Hopefully on the positive side. I'd really like this bike and this tech to work as advertised.