I like using it to speed up recovery in many dungeon fights that have aoe, like after Shinryu's hellfire, Zenos aoe attack in Ala Mhigo, etc. Basically, if you've got several people with missing health and are going to use a medica 2 where more aoe will likely be coming out, it makes a lovely splash heal. I'm sure it's higher tiers work well in higher content, but as someone who tends to focus on dungeons, I figured I would share my experience from that content.