Hi I used to own one a few years ago. It can hold a lot of weight. I had a SME 20/2, BAT VK51SE, BATvkp10se and a esoteric dv50s. All about 50 lbs each. It had plenty of lift to spare, weight isn't a issue with this rack.
It did improve the sound, especially the turntable. I did find various footers and shelves also helped it...I tried the symposium rollerblocks and ultra shelf under my table.
I've since moved on to a Finite Elemente Master Reference. For the money, the Arcici is a great rack.