I did a fair amount of testing with my 100 lb floor standing speakers to solve the specific bass issue I was having in my room on a suspended wood floor with carpet. The room is treated with bass traps but the problem was the floor. I tried the following: spikes, no spikes, "gliders", spikes on limestone platforms and no spikes on limestone platforms. This also included various speaker let up locations. The Townshend podiums solved my specific issue and provided additional benefits of an increased soundstage and depth as well as more pin point instrument placement. They do wiggle a little bit if you bump them but it's minor and I never have a concern about that. As always, your results may be different.