Wondering if anybody here has experience with mechanical strops (like the Kanner Slyde Stroke) -- and if so, how they compare to regular leather strops. Do they do a better job generally? Worse? About equal?

They seem to have a little collectible value aside from the more obvious use - what does one look for in a straight-razor compatible mechanical strop? Are there any new ones currently being manufactured, or is it strictly a vintage market? What is the gold standard in mechanical strops, or some of the other good name brands?

Have to say I am more than curious about the subject, thanks for any help -

Dan