Personally, I think the maple platform will give you better sonics (anytime) over glass.
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Kill the glass. If you like the look of glass, maybe finding some 3/4 inch to 1 inch thick acrylic. Tap Plastic should be able to help cut out the corners to fit the rack. When I first purchased mine, I ordered them with the MDF shelves. They are like 1/4 inch thick. That was a joke. What I ended up doing was sealing the legs and filled the with sand. I doubled the shelves w/ a layer of vibration-absorption vinyl. That actually worked well. I also got a few pieces of granites cut to fit, sandwhiched them w/ maple board(on top) and vinyl. These days, the Soverign racks have been moved to support HT gears as I've upgraded to other racks, fist to a Solidsteele 5.5, then to all SolidTech reference racks. Both times, the improvement were very noticeable. So I think you need to decide how much you like them, and whether you want to throw in any more money into this rack.
I purchased two 2' x 2' concrete patio slabs and a solid concrete bird bath pillar from Lowe's. Put one slab underneath, one slab on top. Total cost: $35. Previously I was using come cheap old wooden stand, which was picking up a lot of vibrations. This new home-made gave a huge improvement to the sound, and didn't cost much at all.