Yesterday I was talking to bent dealer about different types of bents. He brought up something I had not previously heard. When I told him that I was considering a high racer style bike such as the RANS Force 5 or Bacchetta Corsa he said that body positions on those bents could potentially cause knee and hip problems. He sells EasyRacer and Lightning and said that the body position on either of those bents put a lot less wear and tear on one's body. He said his source of information came from 20 years of experience from selling bents.
Does anyone have any experience in this area or know of some resources that would support or reject what he is telling me? I searched the archives here and didn't find anything related to this.