Did anyone experience Audio Prism's Ground Control

I got a pair installed on my Duevel Bella Lunas driven by a Wavac EC300B. The effect is not subtle: much increased air and transparency in the treble (particularly noticeable on splashing cymbals and the like) as we as more articulation and speed in the bass. Weird but effective

I have standard GCs on the Duevel Bella Lunas driven by Wavac EC300-B and have now added a RCA Reference GC to the AudioAero Capitole SE which already had an Acoustic Revive RGC-24.

Amazingly! the two devices are compatible and reinforce each other in terms of blackness and separation. If anything, the soundstage has become more physical, i.e. individual instruments have additional specificity in lateral and horizontal space. There is also additional detail e.g. in reed rasping of clarinets or saxophones and decay of cymbals. When disconnecting the AR device, the shrinking of the soundstage noted by others when using the reference GC is clearly evident.

I guess there is a lot more to grounding and much of it is experimental