Also, for everyone who posted in this thread, could you post how much you're paying for your internet speeds and what your network consists of? That is, modem -> router -> ethernet adapter.
To answer the AC question, yeah it's the AC wireless frequency. I hadn't heard about it until my parents were getting sold on this router. It's a really cool router and I haven't had time to play with it (meaning I think i can connect a hard drive to it and access those files on my laptop elsewhere in the house)
My parents said they have their internet bundled with the house phone, and that bill is about $65