Just bought one of these a couple weeks back after selling my Husqvarna dual sport. Was not riding the Husky much anymore, and since it was a 510cc it was like a $170 registration with the 499cc cut off. Ride my Super-Moto significantly more and being a 400cc bike it's like $70 a year registration.
https://www.bikesdirect.com/products/motobecane/full-suspension-mountain-bikes/ebikes-hal-eboost-m600-29er-electric-mountain-bikes.htm
Have ridden it 5 times going about 10-15 miles each ride and hardly broke a sweat. Was surprised my legs were not sore in the least, and how easy hills were. Any exercise is good exercise, no? Looking forward to getting out to some local trails soon. A couple guys in my Jeep club do it all the time and I am looking to head out with them this weekend. They are old and fat too, so I think I can keep up...