We are utilizing A W651 Controller,9 ap's, and a powerconnect PoE switch to cover our 155,000 sq ft warehouse. Everything is working great - 1 AP failed (after 15 months) and was replaced by NBD. Setup is pretty easy with the Wizard - if you install the controller before the ap's, and upload a map it will suggest install locations. A neat feature I was unaware of until after install. Controller has 4 PoE + uplink ports and functions as an access point. For smaller installs no additional equipment is needed. I would recommend this system based on experience so far.