I'll expand upon my interest (but only 3 test-ride experiences).
My interest in 'bents was first stirred many years ago in the hills near Santa Cruz California.
I was 'just cruisin along' on a moderate downhill grade.
Before I know what's happenin - a big neon green flash blows by me - musta been 50+ mph.
Disappears around a bend in nothing flat.
What the heck was that!
I accelerate to top speed for many miles.
Never to be seen.

I had my suspicions as to what it was but several months later I found out for sure.

http://www.calfeedesign.com/stiletto.htm

It was a prototype of Calfee's recumbent, ridden by a guy using a full bike, lyca stretch, neon green, aero sock.
Also learned that Fast Freddy Markham was the consultant or designer on the bike. Validates the possibility of 50+mph.

http://www.gizmag.com/go/5830/

I agree with Tom B - the long wheelbase, low bottom bracket design was most comfortable for me. Every other design required a bigger leap into the unknown and unfamiliar. Will wait a while, but I know I'll own one while still able to ride hard.