I have not used the new soles, but frankly don't buy the BS they are spinning about them. Sure they might work great with studs, but explain to me how that works for those of us that fish out of boats, and especially the folks like me who fish out of rafts. Answer, it doesn't, period.
There is no way I will believe a rubber sole will grip without studs on the angled clinch ledges covered in grease. Felt does a pretty good job, but still can leave you swimming.
Simms claims they received so much negative mail that they are rereleasing felt sole boots next spring.
I will not EVER switch to the rubber, unless someone can prove it is equal to or better then felt.
Screw the tree hugger crowd.