I just installed Herbie's decoupling gliders on my Focal Kanta 3s, the regular titanium version, and have wood laminate floors over concrete. Love the improvements especially for the value.
My impressions versus stock metal discs: bass is cleaner and more tight, which allows the midrange to be slightly more pronounced which is exactly what I was looking for. Made the system overall more balanced in the best of ways. The gliders did that perfectly and couldn't be happier.