Blind tested with my family for years and it works. Gives strings voices percussion that last 5 % realness factor. increased resolution without fatigue. If the recording is great it will make it better, if it’s not good it will still be bad.
I downsized my system and moved my setup so didn’t have the proper distance from the wall, symmetrical setup that utmost important, so this device became less relevant. I find most people on this site expect an increase in performance without first having perfect positioning. If you have one speaker in a corner and the other without a boundary, spend your money elsewhere- you might get a bit more resolution or tone but go back to basic before you spend big money on cables and conditioners. If you have the basics down in my experience this is a good product to chase a bit more of the dream.