I just picked up the Rivershed Vibrams. used it on the E Dub only so far. not much of a challenge their, but do notice they really don't work quite as well as felts. However for what they are they do a pretty nice job. I am very cautious while wading making sure i have good footing. so i'm not too worried yet. but i do plan on picking up the HardBite star cleats for me for that extra grip. just wait for the local fly shop to get em in.
The Rivershed is definitely heavier than my previous Korkers, but it does have a lot more ankle support which i like. I also like that it seems to be made a lot more rugged on the sides. I had a problem with Korkers taking too much damage on the sides. I still plan on getting another pair of Korkers because they are so comfortable for the long hikes.
btw, do any of you guys reinforce the stitching on your boots? glue or whatever....