I have had bad luck with both wearbars and gripstuds in rubber soles.
The grip studs, which I used in bootfoot waders, rusted out (turned to dust is more like it) after 2-3 seasons leaving holes that can't accept new studs.
The wearbars in vibram bent over and pulled out although those that did not held up better than the grip studs.
The Simms studs have worked best for me on rock but lack the length for grip in weed. They do wear down but can be pulled and replaced repeatedly. Stud loss is infrequent.
I've been tempted to retry felt with washers/studs but feel that the felt itself would wear quickly (I used to only get 1 season out of simms boots with felt soles and built in studs).
Frustrating.
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