Not much to say : great idea, excellent materials, very good design !
I use my HALFBIKE 3 mostly to commute from home to work everywhere in France. It means I put it in my car from home to the railway station, fold it just before going in the train, then ride it when arrived in a new town. It's easy, convenient and very fun.
I used a foldable bike before. The HALFBIKE is lighter, easier to place in the train (or in the car trunk), and the good point is I can keep it with me when entering a store, for example. No need to leave it outside.
A few things could be improved : even with optionnal fenders, your ride can become a bit wet when the weather is bad. Folding requires to struggle a bit with the 2 lower levers, more than I had to to with a foldable bike for example.
These are details anyway. I would buy it again without hesitation !