It a Russell seat, installed a few months ago by the PO. The PO was a pretty big guy, over 300 lbs. I weigh about 200, and was a little wary of it at first. But after a couple of 100 mile-plus rides I find it extremely comfortable.
It's firm, but does not contribute to butt numbness or fatigue. The side bolsters on it tend to hold you in place, you don't slide around on it. I thought about selling it and putting on a Corbin, but now, I'm going to keep it.
Here's the farkle list, most of which came with the bike. All new, installed last fall by the PO who was outfitting the bike for a long adventure ride, then decided to buy a big BMW!:
Pro Taper bars
320mm front disc kit
Large rear rack
Happy Trails SU rack
Happy Trails highway bars/bike protector set
1550 Pelican cases
Progessive fork springs
Uprated shock spring
Eagle Mike raising links
Upgraded switch gear w/push to cancel signals
Clearview tall screen
I-Brake LED brake lamp
Wolfman tank bag
Wolfman glove compartment bag
ATO weatherproof fuse kit and Accesory fuse kit from TWC
Power Madd handguards
I can't wait for warmer riding weather. I ride to work now all days that don't have snow/ice.