It depends on cost. I like to have my customers upgrade to the 3600's. this allows for the AC module, even though there are not many devices that support it. You still have to look at oversubscription of the AP's gigabit port and or your link from the access switch to the core. When using 802.11n, you can start to oversubscribe the AP's port. I typically will not allow guest or maybe some other traffic utilize 802.11n by disabling WMM on the WLAN. I still recommend 25 devices per AP but you have to look at how many device each user will have that will use up a lot of the bandwidth. Usually just laptops. So even with a phone and tablet on the wireless, you still take that into account but not as a laptop. A person usually works on one device at a time. Now if they are streaming video and or Skyping while downloading a huge file on their laptop, that's a different story.

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