I also ride a trike but own two regular two-wheeled recumbents as well. My Greenspeed GTO trike has a mesh seat reclined at 45 degrees. There's nothing rigid about riding in that seat. It is comfortable and very relaxing. I don't often have significant back problems but when I do, I can ride the trike way more comfortable than I can walk. My other recumbents, a Linear LWB and Haluzak Horizon SWB are much more upright. They are still pretty relaxing to ride although I rarely do ride them. I recently picked up a 1990 Specialized Rockhopper MTB and rode it on an 11 mile group ride two weeks ago. It didn't take long to remind me why I don't ride uprights very often. Too darn uncomfortable, even for that short a ride.