Figured if @GJM is noticing an improvement, this must be something I ought to try. Came in today, in the midst of moving 100-lb rocks around - - - with my spousal unit directing - - - to create a border in the yard. A slightly stiff back and a moderately smashed finger later (that's only slightly purple), I took a break and installed it. Certainly feels different (heavier), but will be first of the week before I can try it at range. Expecting improvement!