About two years ago, I started a thread here after I installed the Heavyweight Counterweight on my Rega RB-900 (with VPI HW-19 Mk 4 turntable), and my commments were basically the same as Buscis2's. I have been an audiophile for about 40 years, and have not been much impressed with most of the "tweaks" I've tried or read about. The Heavyweight Counterweight, however, is worth every cent, and makes a MAJOR difference in the performance of my RB-900 arm. In some respects, the money spent on the Counterweight may well be the best "return on investment" I've ever heard with my analog front end. I've only given an unequivocal recommendation to a few "tweaks" over the years, but this one is probably the only one I've had no hesitancy about it.
If you want to review my original post, here is the link to the archived thread:
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1003547794&openusid&zzSdcampbell&4&5#Sdcampbell
And, for what it's worth, the last issue of The Absolute Sound reviewed a bunch of after-market products for tonearms and turntables, and the reviewer gave what was essentially a rave review of the Heavyweight Counterweight.
