Gewa Rims 10" Tom

Bought 10" and 12" versions of this. Fitted to my 20 year old Premier Cabria rack toms, which had the simple holder screwed to the drum shell. Out of the box there was negligible improvement of sustain, however when refitted with rubber and steel washer combo between Gewa mounts and original premier holders, the toms have ressurected and began to sing with great resonance and fullness. Still not the same as holding the drum in your hands, but can't complain in regards with the price. Curious to see what impact other brand mounts would have.