I'm not too bad on a reclined bike at my personal trainer's, but I wouldn't want to do that for more than 5-10 minutes at a time.

This is what I ride: http://www.greenspeed.com.au/gt5.html

Up hills, down hills (72KPH, Wheeeee!), and the seat is just as comfy after 118Ks as it is 1st thing in the morning. And no back or arm problems.

:)