I've got a Super Puma with a DRE frame on it, the Gunnison Frame I think? Does not have a drop floor on the front seat and just has the bench w/o the regular seat. Most people complain about the mushy front floor and I'm thinking about building my own drop floor. I think it would definitely help for the stability.
But for chucking streamers, the bench is AWESOME. You stand on it like a flats boat and you get great perspective on being able to see the streamer in the water and strikes that occur.
I fish/row all of those rivers. Always looking for more row buddies. Hit me up!