I've fully leveled obsidian mind and tested it out. It's a great helmet for sure, but only on the first look. I don't know about you guys, but all I do in this game besides pvp is nightfall, weekly and raids. The main goals during all those pve activities are to survive and help out teammates. The second life on a sunsiger is just too good. Obsidian mind can clear out mobs, but I can do that too with my solar granades during my super as a sunsinger. My claws of ahamkara are much more useful. If you know how, you can become a tank and stay alive for ever. In the end obsidian mind is just a mob clearer and will force you into taking greater risks, nothing really good for nightfalls or hard raids. Oh and by the way, that Bad Juju combo is so retarded. I tested it as well. Sure my super gets up pretty fast, but would I ever use bad juju over ice breaker or gjallarhorn on the raid or the nightfall?! Hell no.