Sistrum Platforms under floor standing speakers

Has anybody tried using these platforms underneath any medium sized ( about 100 lbs ) floor standing speakers ? I understand what Sistrum is trying to accomplish, but I was just wondering about stablity while on the platform, sonic improvements..etc.....I am currently using ''their '' two inch Audiopoints to get my speakers off the floor and was wondering if spending the extra money would be worth my while on their platforms.