I tried a set of Isoacoustics for my 4367's. The spikes are a bit short and I have thick carpet over concrete, and, at the time I thought raising the speakers up a bit could be good.
People raved about these things. I absolutely could not stand the effect, I found no good from them. To me the music became gutless and I can only describe the sound as similar to speakers being very apparently out of phase. I honestly didn't want to listen to my system when the stands were used.
In case it could make a difference the bottom of my speaker where you screw in the spikes is not flush with the cabinet, so a square piece of wood was custom made with a hole, once the wood fit over the part not flush, it became a flush area for the Iso's rubber cup to meet the speaker cabinet. Without the piece to make a flush area the stands couldn't be used. I really can't see how this would make any difference, but, who knows.