While it's rideable, the Livewire is still very much a concept that is still in development. The range is limited to a little over 50 miles for the demo units, and the top speed right now is limited to 92 miles per hour. Leno actually seems a little dubious about the Harley at first when he's checking it out in his garage and openly points out some of the design features that grate on him.
Once he throws a leg over it for a ride, though, some of those little complaints seem to melt away. In its current state, Leno compares the ride of the Livewire to that of a 500cc bike, and he especially loves the regenerative braking and lack of noise. It might not be perfect in Jay's mind right now, but he definitely warms to the idea.