I would have bought an ac Airport Extreme a long time ago if it were not for its impractical design. I wonder how much sales have been lost to this. The design is totally rack-unfriendly. I don't care if a rack partly blocks the signal, I have a dual band Extreme working very well in such an environment at its lowest power setting. Provided it does not perform slower as an Extreme, an Express would be a good alternative if it had a gigabit port, simultaneous dual band ac, and supported hard drives, as I use my old Extreme only as an access point and slow NAS (I will not buy a Capsule, even with a rack-friendly design).