it's about context. if you have pushed the envelope of vinyl performance to a certain place, then small steps are valuable. if not, then no way to relate the value of taking exceptional vinyl performance a little further. and i'm not claiming any universal benefit beyond my gear and system, although i would expect the Durand Record Weight to be effective in most non-vacuum hold-down set-ups, i'm simply guessing about that.
i'm assuming you have read my comments. if so, they do explain my perceptions of the benefit i percieved.
besides that, i'm not exactly sure what you are asking.....with all due respect, of course.
Whilst I have previously been skeptical and guffawed at such components in my system context - I see Mikes point. It's not a case of saying get yourself a Sony USB for $50usd and putting a Durand weight (extreme example)
whereas as a final flourish or as an enhancer it might just be the missing piece