I've used the ring for a couple MP9/10 Uber runs and Act 3 MP10 farming; I've come to the following conclusion: it's an amazing ring! It adds dps/ehp and allows me to more efficiently run SNS. (Note: My current gear set up is not for Ubers MP9/10; I usually put in vit gems/an amulet with 9ias, 8.5cc and 800loh.)
Would you recommend I sell the ring and buy other upgrades? - or should I keep it and continue farming until I have enough to buy a 250 average damage/8-10apoc Chantodo's Force?