I live up a long, steep hill, so descending into work is not an issue, but climbing back up is still something I am reluctant to make a daily chore without help. I was looking at the Copenhagen wheel, too, but I saw the caveats about warranty support, and it just doesn't make sense for me. I may still consider a full-on e-bike to go car-free, but for now, my two-part commute (driving to the flats and riding from there) still allows about an 8-mile round trip on bike, so I'll continue that.