Gdush,
I have a Richard Gray 400 and I recommend it. I noticed no difference with my amp plugged into the wall directly or into the RG400. I actually have all my 2 way components connected to the RG400, and all my HT components plugged into a Monster power strip. I then plugged in the Monster strip into the RG400. Still noticed no difference. Supposedly if I plug the Monster strip into the socket next to the RG400, it will gain the same benefits as being plugged into the RG400. I haven't tried this though.
I don't consider my system the most resolving, but enough to tell the difference when swapping out components.
I have a Richard Gray 400 and I recommend it. I noticed no difference with my amp plugged into the wall directly or into the RG400. I actually have all my 2 way components connected to the RG400, and all my HT components plugged into a Monster power strip. I then plugged in the Monster strip into the RG400. Still noticed no difference. Supposedly if I plug the Monster strip into the socket next to the RG400, it will gain the same benefits as being plugged into the RG400. I haven't tried this though.
I don't consider my system the most resolving, but enough to tell the difference when swapping out components.