I've actually used it in a raid enviroment now we've got into Mythic hans and franz theres a couple of phases where when your group has 2 stacks you need to burst heal them up, but you cant use a tranq because the phase happens every 1 and half minutes for example.
I've been using TOL+ NV rejuv spam and genesis for one phase, and tranq for the other.
Also with the spirit increases I'm sitting at 1950 spirit + chewtoy proc, giving me an insane amount of mana regene allowing me to rejuv spam more, and genesis if i want to pad the meters a bit