Brand new TMO M8.
Was able to unlock bootloader (HTC Dev method).
Loaded Philz Recovery via ADB.
Rooted via adb flash SU method.
Cannot S-OFF with Firewater (firmware 1.57), getting "whelp, this sucks."
Posted a pledge on the firewater bounty page.
Now I read that one actually does not need S-OFF for loading custom ROMs, which is good...
One M8 - InsertCoin 3.0.5
Galaxy S4 - Wicked v
Sensation - EnergyROM
Nexus7 - rooted stock