I have put about 400 miles on my R-20, and, unlike many posters here, have had a reasonably good experience so far. Haven't had any of the common problems addressed by others -- YET. Very thankful about this, because my experience with the EVTA "service department" has been abysmal.
One serious problem for me, however, regards the poor suspension of the bike. The ride quality on anything other than a great road surface is pretty hairy. And if you hit a pothole with this thing at 30+ mph, good luck!! For this reason alone, it's a good thing that the bike won't go faster than (the less-than-advertised) top speed of 38 mph. I would really like to reduce the anxiety factor by upgrading the shocks. Has anyone done this so far? Any recommendations?