Easy,
@Ann M.! Don't be such an Ecoreco hater. Have you tried it?
Tossing a 250w motor onto 8" wheels significantly increases the torque. I was able to go up the 3-4 story straight ramp at interbike an Ecoreco without help, (something I didn't expect of most of the ebikes). I was blown away. It's using a 8.8 ah 36v, which is good for the size. The company guys I spoke with said 8-12 miles full throttle and 20 balancing them out w/ human power. Shop owners I've spoken with agree and say that they're the very best of their type. That's comparable to e-bikes of the same battery capacity. To be fair, I can burn through my D-Series Bionx battery in 8 miles, contrary to company claims. Or I can get 80 miles on level one. Battery talk gets super relative.
Also, I don't follow the battery replacement statement. The Bionx system has been programed to ensure better life, but we're seeing about 4 years 800 cycles with the stuff we've replaced. It should be better now. Bionx says as little as 3 years and as much as 7 years till replacement. Honestly, I'm expecting 4 years out of any decent ebike battery. The e-Joe chemistry is rated to over a 1000 cycles and we haven't had one exhausted in the year and a half we've had them. Most importantly, Court mentions that the Tern is using a special small Bionx battery, which makes it's super-proprietary. Bionx batteries by themselves are about 3x the price of an e-Joe battery. Conversely, the e-Joe battery isn't proprietary, and becoming pretty common. You'll be able to buy it with more range than the current model, for much cheaper than the Bionx, and from sources other than e-Joe (not that you will need to, hopefully).
If you're going to get the Tern-e, get it because it's the better bike and totally worth the price.
@GiantEnemyCrab has point about the Ecoreco on rough streets. Don't even consider getting the model without suspension. You'll regret it.