Pic related would save spirit builds.

Classic LoL theory about "when do I buy Mejai" seem to place it as a desperate comeback item, which makes sense. But I've tried it out in super-even super-neutral games where neither team really dies a lot (poke vs poke usually) and it feels really good because as soon as you get a very slight advantage and can get to 10 mejai stacks you can turn the match on its head and start snowballing. Thoughts?