The PBXL will not replace a profile like the Sledge or Aeron, though is allot of fun. As Jeff says, its easy to build and is a great trainer for Hovering, Harriers, Elevators, flat spins, rightside up and inverted. I appreciate Jeff posting his thoughts. It is not easy to convince people of an aircraft's capabilities when you are the designer. It helps to have others express their opinion.
Thanks!
Kevin