Well, there's not much to say about this. It just works. And works really quickly.
I spent half a minute of polishing per fret, and they're shinier and smoother than ever before. I wanted to buy steel wool, but gave a try at these and I will use this until I burn them completely.
Look no further, myself as a sceptic got convinced really easily with this rubber. (I never knew there was a rubber that can polish frets so easily, you learn something everyday).
Best buy, won't look further for anything else, this is something I'll use until discontinued or upgraded for the same price.