I've tried a number of record weights over the years from simple weights made of aluminium or other materials, from light to heavy, to more complex designs such as HRS. I've tried them on various turntables including low mass - Linn and Rega - and high mass - Kuzma Stabi Ref, Spacedeck - and my current PTP Lenco. Without exception they have made the sound worse. They do generally tighten up the image, but suck out tonal richness and dynamics.
(I also don't rate the Achromat - I have two of them in a drawer. I use a Collaro Tempest mat on both my PTP Lenco and my Rega P8.)