I am in South Florida. I fully charge daily, and commute 87 miles 5 days/week. No issues so far.
This is on Florida highway speeds from 65 to 75 mph. I moved from a c300 and this is MUCH better. I had several S classes and still have a 2007 SL550. I can hands on compare the B class. This is a great car.
We also have a Nissan Leaf. Wife uses it for a 40 mile daily commute. Don't even compare.
The leaf is ok in city drive, but will not withstand the SF parkways for much long. I tried, and could not use it for my commute.
One thing I noted comparing the estimated range in the dashboard, the B is a lot more honest in predicting range. Neither the Nissan leaf or the Tesla (friends car, not mine) do a good job there.
I purchased it used, less than $23K, and was the best money I ever placed on a car.
Fingers crossed, if it holds, I will turn 100k miles on it in no time. That is over 4k gallons of gas I will not burn, and $12k in my pocket.