ignore the haters. i bought an 888 on a lark and it worked but not as much as you describe. then i bought a $100 ebay linear power supply for it from china and its performance was 2x (at least), and now its indispensible. ---reports of greatly improved performance with something better than the stock power supply are wholly accurate and should be explored asap (any 12v 2a is fine, standard dc jack).
Plethora of Schumann Resonance Devices
Tried an Acoustic Revive RR-77 a few years ago and have been duly impressed. Since then Acoustic Revive has replaced it with the RR-777 and now the RR-888. Kemp has an SR-Plug. Space Technology Laboratory (Canada) has come out with four different models and there are several different units on E-BAY from Indonesia, Bulgaria, England, etc. There's even a unit from Less EMF being marketed by Sears.
I'm somewhat naturally skeptical, but there's no denying that this little RR-77 box has made the single biggest improvement in my system than any other tweak I've tried (and I have tried a bunch through the years).
So given all the new Schumann based products out there, I would be interested in what's working and what's not. The price range in my personal survey runs between about $70.00 to well over 3 grand. Any help in sorting these products out would be (as always) appreciated.