The Babymaker bike is absolutely perfect in the city and on the flat. It handles very well and I'm really happy with the way it rides. The belt to replace the chain is excellent. The remaining mechanical parts are also excellent.
Unfortunately, I have to say that it is very disappointing on the climbs. It can't cope with big gradients and gets to the point where it inexorably stops. I suppose that's the price you pay for an electric bike that, for all intents and purposes, feels like a classic muscle fixie.
Another negative point is the unreliable battery status computer. Sometimes it shows less under load and, unfortunately, I've had it stop even though two seconds earlier it showed two notches. This could have been done better. Also, the charger is a bit too noisy.
However, there are electric city bikes that cost up to 5,000 euros, for example the Coboc Bike. With a fifth of the price you can't expect perfection.
All in all, it's a bike I like and am proud to show others.