Well, all I really have is my MacBook, which works with 802.11n 5 GHz. I don't really connect my phone to WiFi at home often. My new place is also a studio, so walls wouldn't matter since there are none between myself and the router.
I was looking at getting the Apple AirPort Express, but I wasn't sure if its performance equaled its price. I'd really rather not even consider the Extreme, I'm sure there's an another manufacturer who can provide the same performance for cheaper. $159 is a bit much for just a router, imo (edu pricing).
Apple has an info page, but doesn't list the transfer speeds anywhere for either. http://www.apple.com/wifi/
and also clicking each for detailed tech specs