I bought the one from Monoprice. Works great! Needs power, though, and I still get a weird message that says something like your phone is using more voltage than can charge the battery or something like that, and just drains battery. I don't know what that's all about.
AT&T HTC One M7
Bootloader Unlocked, Rooted, S-off (Rumrunner)
Insert Coin Sixth Sense v2.3.1
Past: HTC One X, HTC Inspire 4G, HTC Pure, Samsung Blackjack II, Motorola V3xx, Moto V3i, Moto V3, and a whole bunch more...