I have used the Acoustic Revive- RG24 grounding disc , the Synergistic Research original Grounding Block, and now use the Synergistic Research Active Grounding Block. The SR Active is the most effective and most expensive of these devices.
I would not like to listen to music without one of the Synergistic Research devices. They are now installed in 3 different systems that I listen to.
If I was trying my first grounding device, I would look for a product with a 30 day trial policy to see if the cost benefit ratio is worthwhile.
David Pritchard