I've decided to get off my ass and finally get VLANs setup ... The hidden SSID isn't about security, it's about usability. It reduces the number of broadcasting guest networks from 2 to 1 ...

especially on devices that have 2 radios. In global mode, you can assign a VLAN to a SSID. Excellent. What is not excellent, is when things mysteriously don't work when you assign vlans to SSIDs.