The Finite Elemente Cerapucs have a high load rating and are usually used as the feet of a rack supporting several components. I have the Cerapuc on my FE Spider rack. The Cerapuc is not optimized for supporting lightweight components.
For individual components, the Townshend Seismic Pods are said to be one of the best isolation products in the current market, if not the best. They have several weight ratings to cater to different loads. The Isoacoustics equivalent which is the Orea is said to be inferior.