Seems like the poor EVD gets little attention on this forum. I have not posted much because it has been a great scooter with very little problems. It does what it was suppose to and I have been pretty happy with it. R Martin is quick to respond and has taken care of all of my part requirements in a timely manner.
The process of insuring and registering the scooter with the Nevada DMV was very easy. The insuring took a little work to educate them with pictures.
When I first got my EVD I had one of the 60AH Lithium cells that was a little stubborn taking a full charge. After I cycled the individual cell a couple of times it has kept pace with the other cells. The 60 AH cells are more robust than the 40 AH cells and do not have the voltage drops under load that you see in the 40 AH cells.
For those that have been having tire balance issues, a product Dynabeads is available that can be run in tube or tubeless tires that have done wonders in my other motorcycles http://www.innovativebalancing.com/motorcycle.htm . It can however be a challenge feeding the ceramic beads thru the valve stem.
Like MikeB I had been experiencing the low voltage warning in the cold weather (below 45F). But it never caused an issue with the scooter.
I added two additional cells to the pack and currently have been running a 23cell 60AH pack. It will go faster than I feel comfortable going in a scooter +65mph(GPS).
It would be interesting to find out what if any real difference there is between the EVD and the XM-500Li. To me they look like the same thing with the XM being more exspensive, but I may be wrong. After my early XM3500 experiences I doubt I would buy another X-treme.