I found a pretty good review video. It highlights the bump you'd get at start and the fun when you got used to it.
All the pros and cons. What you should and should not expect from it.

Since I didn't have 10 posts in this forum yet, I cannot post the link.
You can search it with the title "Crazy trike with rear wheel steering! - The Halfbike" by "Seth's Bike Hacks"