We've been using EPGPLootmaster since sometime in 5.1, but we just use it to distribute loot with loot council and ignore all the EPGP functionality. But it works just fine in 5.2 as well, and I don't see why the EPGP part of it wouldn't work if you wanted to use it. But I'm actually not really that familiar with that loot system.
We use EPGP Lootmaster to hand out loot, and EPGP Reloaded to sort EP and GP manually (incase there was a mistake). Everyone in the raid needs EPGP lootmaster, but only the lootmaster needs EPGP reloaded. Raidmembers can have Reloaded if they want to check standings though.
Although they seem to cause UI discrepancies from time to time they work perfectly fine for loot distribution and effort tracking. Since blizz got stingy about what they will allow addon developers to access in mop many addons have the occasional collision that causes you to need to reload.
We use the same + RaidRoll for distribution of loot. No problems for 5.2.
The major bugs before 5.2 were: auto turn-off announcements after 2 min afk and double GP-window after loot distribution.
This double GP problem happens because the 'Loot' option is ticked/enabled (by default) in EPGP (dkp reloaded) options. This option does not need to be enabled if you are using EPGPLootMaster for loot distribution.