Ruckus almost consistently scores in the top of performance tests in high density environments (e.g. more than just a few clients connected to an AP at a time).
http://www.ruckuswireless.com/carnet-performance-testingIn these tests, even the old Ruckus 7982 3x3:3 (802.11n) outperformed Cisco's highest-end 802.11ac 4x4:4 AP with 60 clients connected!
Also, Ruckus is the only AP with BeamFlex antenna technology, which directs the wifi beam in the direction of clients. This tech makes a huge difference in delivering excellent signal strength to clients, without all the traditional problems of nearby AP's interfering with each other.