I've never had studded felt soles before, but just bought a pair of Patagonias on sale a week or so ago. The main reason I avoided them is because I don't want to tear up the floor in my boat, not to mention wearing them in the raft. For ultra-slick rivers like the Thompson I wear Bailey's stream cleats over my wading boots and carry a wading staff. I don't think I want to bother with the screw them in, screw them out alternative. Besides I'm not sure how that works out as the felts wear down.

Sg