Hi. I did owned Symposium platform before but sold them due I start make same platforms my self. My platforms are made from aluminum, rubber, and compressed foam. So, basically same as Symposium. The bigger improvement was when I use them under my TNT turntable. They light but sturdy and they hold more then 250lb. without bending. Can send you pictures of some I make for my friends. Let me know........ Ritchie
