I don't think I could ever be comfortable on that bike even if the seat was very comfortable. I think cars and trucks would have a more difficult time seeing you. It might be fun in the twisties though. If it was an ideal design, you would see a lot of them from the bike manufacturers.
That feet-forward riding style not only makes you look like you're on an OB-GYN table, but also curves your spine and puts your weight on your tailbone, instead of on the base of your pelvis. That's a recipe for backache. I don't see how I could be comfortable over anything other than short jaunts.