i am going to buy a Boltz media rack soon. i hear they rock...and expansion kits are cheap. I wish my POS rack would break a glass shelf so I can buy a new one, but until that happens, I'm stuck with it. I shouldn't be too negative about it, but the "Progressive Structure" stuff is expensive for the quality of construction...3 steal poles with slots cut out for the glass shelves to slide into. They do supply rubber "feet" to keep the glass off the steel, but $500 for that???? My own fault.