Oh, and if you are interested in trying one, you can come down to Portland Memorial Day weekend and find someone (like me) willing to let you try one out. That whole weekend is an HPV mecca and there are expected to be over 20 velos there of different designs, as well as every other form of recumbent you can think of. It's also on an enclosed track, so not so much danger of damaging someone's velo.
http://lcvmg.com/
http://www.ohpv.org/HPC/index.html