I tried the JB Stik on 3 fittings, two of em fell out afterwards, so there's a problem with adherence, which I haven't had with the Weld, the other one I ended up removing with a file, it seemed wood like or spong like in comparison to the Weld, so I don't really have any confidence in it. Maybe mine is defective or too old, but my money is on the Weld at this point, if it holds up to the .500 and .300 WSM, it will work with any standard caliber. I also don't rely on the epoxy behind the shim to hold it in place, I bend the shim over the end of the underlug so even if the material under the shim degrades, it'll still be held in place.
I re-fitted the .270 Ultracomp barrel with a .026" SS shim to replace the original JB Welded shim that was holding up fine with what little I shot it, about 15 rounds IIRC, I didn't feel comfortable with as much JB in it as there was, I think having a fitted steel shim in combination with the reinforced insert to fill the void in the pivot is the best way to go for the home do--it-yourselfer without machine shop intervention.
Tim