The sole should be stickier. I think they use the Vibram Idro-grip sole. To me, it isn't sticky enough. For some fishing, like wading the Tulley, Lehigh Valley streams, Spring, they should be OK. Even Penns isn't as slippery as it is extremely irregular and easier to trip. For streams that I'm in like the Allegheny River or Oil Creek, the Aqua-Stealth sole is good, but unavailable on anything except the LL Bean boot. If you wear-in the Idro-grip soles a good deal, they get a bit stickier. I have the discontinued Patagonia Izaak sandal. It's really well made, but uses the Idro-grip sole and aren't as sticky as I'd want when I'm wading.
Rock climbers get sticky soles but wading fishermen don't.
Syl