Not long ago a friend was in town and we were listening to music. He noticed many isolation devices sitting on my bench and asked how many isolation devices have you tried. We started getting them out. If I recall correctly, we had 24 on the floor or that I recalled and later sold.
I also remember first putting the StillPoints Ultra SSs under my Tidal speakers. My first thought was that they made everything else obsolete. Later I had to confess that they weren't the best when I replaced them with the Ultra Fives. The realism of the soundstage they gave was just outstanding.
Later yet the Star Sound Apprentices under my BMC Arcadias were clearly more dynamic and had a sweeter top end than had the SP Ultra Fives under the same speakers. But I knew that I had been unable to use the SP Ultra Fives properly under the Arcadia, given the method they provided for attaching feet.
Of course I have not tried every isolation device, but I think these are at least among the best. And I think each has its strengths. The Stillpoints give one the perspective of being in the audience and the Star Sound Apprentices give one the perspective of where the microphones are placed. In short it depends on ones tastes. One thing is certain, the Star Sound Apprentices are cheaper than the StillPoints Ultra Fives. The SP Ultra Minis, are much closer in price.