Yeah mana is really easy to manage at level 100.
I did Shadowmoon Burial Grounds last night. Mana seemed really good, never dipped below ~50% regularly using flash of light (we were at 660 ilvl but it was still tough to heal).
Not really much to say. EF seems really strong now that it refreshes mastery again. With Rocket boots being speed of light on a 1 min cd. I was freely able to spec pursuit of justice, which helps with brief movement problems we have.