Carbide Audio isolation footers. Anyone try them?

I use a lot of carbide cutting tools in my shop.  I'm not sure they use any carbide.  They don't tell you much about the product but want you to just trust them that it is good.

hard carbide would be about the opposite of springs which provide isolation.

Jerry

PTA and a couple other sites have done reviews and they have been positive. 

Make your own decisions on who you should trust but I don't trust reviewers much. --Jerry