I think this ring should be more popular than it is. A lot of mages walk around with 2xAstral or 2xElectrum Rings well into their 60s, but pairing this ring with a Mana Ring gives you a total of +30 MP, +15 HP, and a Resist Paralyze effect! Sure you get more +MP with the other rings, but they have -HP and no other bonuses.
I like the combo of Antivenom Earring, Insomnia Earring, Ebullient Ring and Mana Ring for a total bonus of +60 MP, +30 HP, +1 hMP, and Resist Sleep/Poison/Paralyze, all with no negatives to stats using just 4 slots. Not bad at all.