Never found any great change in sound qualities on or off. What I find it good for if you have any warped records as it holds them flat. I wouldn't pay a fortune for one as the all do the same thing. Also look at the extra strain it may put on belts etc unless you are using a direct drive then weight shouldn't be a problem.
Technics SL1210 MK2 fully rebuilt and repainted. Ortofon 2M Black Cart, Isonoe isolation feet , MN bearing and Funk Firm platter upgrade, Oyaide RCA Tone Arm and speaker cables, Jelco SA-750D Tonearm. Oyaide HS-TF Carbon headshell, MCRU Linear External PSU, High Fidelity Crystal glass turntable matt, Blue LED upgrade, Denon AVR-2808CI Amp, Bowers and Wilkins DM602S3 Speakers,
Black Rhodium Jazz power cables for amp and turntable, Firebottle mk2 Phono Stage.