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Field and Stream reviewed and tested Simms Streamtread soles.  Here's what they say...
 
Aiming to reduce the transmission of waterborne invasive species, Simms teamed up with Vibram to produce the sticky-rubber StreamTread sole now used on all its wading boots. Like the five other sticky-rubber soles tested, these didn’t give the grip of felt on exceptionally greasy boulders or slick ledge rock, but they held their own on less demanding streambeds and gave significantly better traction on bare rock. The StreamTread sole, however, earned top marks when fitted with the optional HardBite Star Cleat Studs ($40), shown at left. These broad, flat, screw-in cleats are encrusted with carbide chips and recessed into the tread pattern; the result is a low-profile stud that gives a solid, metal-to-rock bite for better traction than plain felt soles on all surfaces, wet or dry. The Cleat Studs are available on five boot models.