I got an LL bean fly fishing catalog in the mail yesterday and they have this wading shoe with the rubber bottom. I'm looking for a new pair of wading shoes and was wondering if any of you guys have any experience with this type of sole. How does it hold up to the slippery rocks of the housy and the farmington? Is it better than felt bottoms or studded felt? I'm thinking of buying this type because of the didymo thing.