I’ve had a go on both the standard and electric Hummingbirds. I love them both. The ride is certainly not lifeless - it’s much nicer to ride than a Brompton, sharper and zippier and not as twitchy. The fold isn’t quite as compact but it has a much narrower profile when folded and this, along with the very low weight, makes it a lot easier to carry than a Brompton.
Even with the weight of the motor, the electric Hummingbird is under 10kg.
I would happily buy an electric hummingbird for the commute if I could afford it.