You and your allies get full benefit from Mastery inside 10 yards, 15 with RoL, reduced in effectiveness out to 40.
Hpal is doing pretty average right now in my opinion. You won’t see it often at LANs over the Resto Druid, Mistweaver, or Resto Shaman picks. The glimmer build is strong and you can do well playing some hybrid comps or wwdk. In 2s it still pairs well with rogue, warrior, windwalker, destro, probably some other classes that can benefit from a hoj setup or chain off hoj/repent.