One thing different about recumbents is the variety, much more than just weight and component quality.
If you are interested in speed, you have short wheel based models (some with dual 26 inch wheels), long wheel based models (especially with a fairing) and lowracer models. Recumbents are a bit heavier, which is a penalty going uphill. But, they are often more aerodynamic. A faired low racer currently holds the world speed record of 81 mph on a human powered vehicle.
http://www.wisil.recumbents.com/wisi...lenge-2004.htm
I ride a recumbent trike for comfort, meaning that I can ride farther and more often with less side affects. I like the trike for climbing and riding around town. Folks seem to notice me more but I still have to be careful coming out from behind a parked car.
The only thing missing was ease of public transportation, so I recently bought a Dahon Speed 8 folding bike that can be folded into a suitcase. I am trying to recondition myself to riding an upright. It is tough.
Regards,
Gary