I have 2 RDL seats, one on GL1800 and one on GSA, I've had Corbin and Sargent seat and I won't go back to either of those 2 seats.
I’ve had a lot of bikes, and seat issues have often been in play.
I’ve had some excellent Sargents. Before the 2008 recession, there was a fellow named Bill there, and he made me several very comfortable custom seats, but I’ve had a few dogs from them since he left.
I’ve had several Corbin seats. The seats are heavy and a bit crude on the underside, but most of them have been comfortable. Corbin customer service and support are pretty weak. At least they used to be.
I’ve had many Russell seats, most mail ordered, but some ride in appointments.
They’re a mixed bag. I loved their seat for the Rocket III Tourings. Hated it for the K1600GTL. Lousy on FJR. Mediocre on Triumph Tiger Explorer. They’ve run the gamut from incredibly good to really uncomfortable even after adjustments.
Buying a seat is a crap shoot. If I had to roll the dice, I’d probably give the first shot to Corbin. You can always resell it if you don’t like it. Every Russell is one off, and although they can be sold, I’ve suffered bigger losses with Russell than with Corbin.