Originally Posted by
Cheze
at ilvl 850 the average reduction (assuming the tooltip is accurate/intuitive) is 575. Assuming a cast every 1.5s (which realistically you probably don't do but w/e), that's a shade under 2000 mp/5, which is quite a bit more than the 840 spine with less active management.
I dunno, I think it's a clear BiS pre-raid trinket... but I'm not sure whether it's worth dropping 250k on crafting and upgrading it.
ed: by comparison the 850 cocoon is 3600 mp/5 equivalent, if you can sit and channel for the full duration (not necessarily realistic.)