I recently purchased a C Evolution from Long Beach BMW in California, and had it shipped up here to Seattle, WA. I am a long-time BMW aficionado having owned a half-dozen bikes and two cars over the last 20 years, including a 2013 C650GT. I am using it to commute to work in downtown Seattle and think that the C Evolution will be an improvement over the ICE scooter due to it's much lower operating costs. I have had no performance problems with the 20 miles of freeway and 10 miles of urban travel on my route (round trip) and have plenty of capacity for running various errands along the way. It's great for running up to the store or going on a little cruise in the evenings or on Saturday afternoon. Just like the C650GT was. I think the C Evo handles better - more planted and stable. Corners like on rails, and the fit and finish seems to be a little better. - the paint in particular. I have been charging it over night from a regular 120v circuit in my garage.
There are a bunch of reviews on the web that are pretty accurate. Moshe Levy's was instrumental in my decision to buy because he pointed out the operating cost costs of the C650 vs C Evolution. The motorcycle.com you tube comparison with a Zero SR (?) is also really good. Having owned the C650, I can point out some differences. Other than Heated grips and a Hella/BMW auxiliary power outlet (in the right fairing pocket) there are very few electrical doo-dads on th C Evo. No Tire Pressure Monitors, heated seats, or electro-mechanical lock releases. I have not (so far) actuated the ABS or Traction control but am glad to have them there to help me out when needed. One adjustment made was the purchase of a BMW Top box with the scooter because of the decrease in underseat storage. My favorite thing about it is that it's practically silent. I also like the way you can control speed as though the 'throttle' is a rheostat - rarely need to use the brakes except to hold position.
I have almost 500 miles on it now. My other bike is a 2016 BMW R1200GSA (Adventure-style bike) and it is a perfect complement to a scooter, particularly this one.