I also really like Isoacoustics for speakers. I started with GAIA for my floor standers and they were great. Then I had stand mount speakers in another room. I use the Aperta between the speaker and the stand. Not only did I get the same sound improvement but also I could add some tilt. I think they helped here even more as my stands aren't that great.
I did try the pucks for my turntable and I have to say that was a disappointment. I guess the built in isolation was enough. I didn't notice any difference but still have it installed as I couldn't return them and don't know where else to use them.