HRS ain't cheap. There may well be better/cheaper solutions but the science makes sense... each shelf being kept separate with big rubberized feet (they probably call them couplers) and heavy granite on top. I have one, I would probably buy another one. Have I compared 7 different racks? No, but perhaps the dealer above (audiooracle) has. Bottom line though, for my amp racks, I elected to go with Symposium Ultras because I noticed a lot of difference using rollerblocks on various things so I am hoping those work well.
Having said all of that, they are well made and I really appreciate the workmanship. My dad is a finish carpenter so I know of what I speak, I have never seen an American wooden product better made.
Cheers,
C