AC definitely files, but I find the range and signal strength on it fairly lacking compared to N (or G or B). I mean certainly some of that will depend on the equipment in use and where it is being used, but at least in my experience things that are close benefit from it, but things that are even just somewhat further away (where N/G/B still work just fine) don't end up getting a good signal often enough.I don't know if I have the best example here, but I used to be on an N router and it just didn't have the chops for multiple devices. As soon as I upgraded it to AC, I smoked the N and max out my speed on several devices running simultaneously.
Old N:
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New AC:
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These are also with my 2 kids on the AC using some kind of streaming service, YouTube, Netflix, Vudu..... Something. Same 100/20 fiber connection, just different router.