I've used the stands for my Neumann KH80, and I can confirm that they fit comfortably on top of them with no issues. I can't say that I've seen much more difference in sound compared to the other stands I've used. The lack of height flexibility, there are only 2 sizes in the box and I knew that while ordering, and the slightly lack of "stability", also this is the selling point of IsoAcoustics, was the reason I wasn't as satisfied as I wanted to be. On the positive part they have a small footprint and they can be packed and travel as the whole structure is lightweight so for mobile installation they are definitely useful.