VX1 and Enertia Plus are an interesting comparison, 5 years apart. Comparing a maxiscooter with a small motorcycle is a little bit silly, but .. it's what we've got.
2007 VX1, $11000 (about $12300 in 2012 USD)
125V 30Ah NiMH battery, 3.7 kWh
20 kW peak AC motor w/ regen, reverse
462 lbs + 476 lbs cargo = 938 lbs gross
max speed 62 mph
acceleration 6.8s 0-50 mph (claimed, not sure if I believe it)
range 68 miles @ 25 mph (claimed), users report 26 mile at 40-50 mph
1.5 kW charger = 10 miles charged/hour @ 40-50 mph
2012 Enertia Plus, $11000
88V 70Ah Li-ion battery, 6.2 kWh
13 kW peak AC motor w/ regen
330 lbs + 270 lbs cargo = 600 lbs gross
max speed 60+ mph
range 80 miles @ EPA UDDS, likely 50-60 miles @ 40-50 mph
~1 kW charger = 8-10 miles charged/hour @ 40-50 mph
Motor and charger performance @ the $11k price point have not moved much, at least in these two applications. Range has basically doubled, though some of this comes as the E+ is much lighter.
Today Vectrix is basically selling the same bike but with a LiFePO4 battery pack. 425 lb / 30 Ah / 3.7 kWh Li is $12k, 460 lb / 42 Ah / 5.4 kWh Li+ is $14k.