I had one way back in the day, very cool and yes, they are more comfortable but less maneuverable. I looking into getting a new one myself since my back & knee problems. Be prepared to spend a few bucks, good ones aren't cheap, but are worth it.
Here is a site..
http://www.bikeforums.net/forumdisplay.php?f=37
And onother one..
http://www.bikeroute.com/ibrd_cgi/Classifieds/class_ad.cgi?database=recumbent.setup
I'll try & find pix of Mine from the 80s..