I was quite happy with my zippy electric B250e. I leased a 2014 and 2017, each for three years, and returned both rather than pay the residual buyout price. The main factor was that the 90 mile range during the warm months was okay but the 60 mile range in colder months was not okay. I live in the city and do not have a place to charge overnight. At work, they only had a 110v outlet. So my decision was to return the car and await longer range choices in 2021.
My salesperson indicated that the 2022 EQC could be coming to the US in 2021. If nothing else tempts me, that will be my next electric car.
Be sure to read the posts about how to check out the used B250e to ensure good operation and active warranty, especially the battery warranty.
Post online if you want to get responses from the rest of the long time owners.