this is a good topic...
I've always thought the Shredder is the ultmate raft craft. I've paddled well-worn Shredders down the Upper Yough a bunch of times, which is full of rocks, and the boat always handled like a champ. We used to sidesurf manky, trashy holes and do 360s without care of flipping.
I've also always wondered about the other options, because used Shredders are hard to find and new ones are pricey with a longish waiting period.
It's nothing that will happen soon, but I would love to have a Shredder in my quiver of rivercraft.