Mazi
Good point, and something I briefly looked at, but not in depth, but I can't imagine a situation where I will Flash Heal twice and then need to PoH, the fights just don't switch between AoE and Single Target enough to end up in that situation. I've found fights to be either Single Target Tank healing heavy or AoE heavy, but not both at the same time.
You must bear in mind that I raid with a Paladin & Shammy healer, and I'm the third healer with OS dps, so all I do is fill the void that they leave. On AoE fights I rock, on single target fights i'm usually DPS lol. I actually switched out of Disc due to the fact that it's completly useless in the majority of 3 heal fights in MV.
I will try to run the figures at some point and figure out if that's viable or worth it, but it's not on my priority list