Canni -- it gets better, right?
My shaman is up around lvl 27 and I've lessened my meleeing for root/rot tactics (which is so easy it feels like cheating). However I've been less than impressed with Canni v1.0. For approximately 5% of my hitpoints, I get back 1% mana. Given that most of my spells take a couple percent off my mana at least, we're talking perhaps 15-25% of my hitpoints for one extra casting. Not exactly a winner.
I already considered that twinking has some effect here in that my mana pool is larger and what's 1% now may well have been 7% back in the day. But my gear is pretty balanced stuff so my hp pool has increased in reasonable approximation with my mana pool. So the ratio should be roughly the same.
I'm guessing later versions will show better returns? Or is that just the way it is? I'm not expecting 1:1 of course but the current output makes me hesitant to even waste a gem slot on it. Maybe mudflation and OOC regen has rendered it partially obsolete.