I had a burton bike bits seat on my bonnie and it was more comfortable than stock but after a couple thousand miles, it compressed and you could see a depression from rider to passenger height. This caused some cramping in the legs for me. Just an FYI... Here's a pic of the bike, take a look at the seat...
'10 Ducati Monster 1100 s | abs
'78 BMW | Recreated | Black
'08 Triumph Scrambler adv
A few recent memories...
'11 BMW GSA, Ducati Paul Smart le, '10 Ducati Multi 1200s, '09 Triumph Bonneville Blk