I also have a pair of Korkers. Mine are the tennis shoe looking ones (no idea of the model). I really like them. The ability to swap soles is a good idea in concept for me, but I never do. When I first got them, I would hike with the hiking soles and swap them to the felt soles once I got to the river. The felt soles don't ever come off now. I guess I'm just lazy. I now hike with the felt soles and just leave them in full time. I do alot of hike in fishing, so they get lots of miles on them.
They are still my favorite wading shoes.