What I like about the new "WiFi Scanner"

I walk into a populated lecture hall. 400+ devices across 4 AP's/8 Radios. Typically, I look at my infrastructure to check the client distribution across those AP's, whether Cisco Prime, AMP or similar. I still might do that, but with this tool I now have much easier access to that data, assuming I can hear Beacons from all AP's. Also, if I'm not the owner of the infrastructure, it gives me the opportunity to see the client distribution amongst the AP's in the area. Something I always want to check is if the clients are being distributed amongst the available radios as much as possible (most vendors market some form of anti-sticky client features). This allows me to check that without logging in to anything. This is pulled from the 'QBSS Load Element' (QoS Enhanced BSS) portion of the Beacon:

This is CU from the AP's perspective...something a client can never tell you. If I see that an AP is showing very high CU (80+%) that tells me something. It may be nothing but a high number of clients, or even a single flow, however it may be something to take a closer look at. This is the AP's view of the percentage of time the channel is sensed to be busy by either Physical (Energy Detect) or Virtual (NAV) Carrier Sense. This is also take from the QBSS Load IE, and is normalized to 255 (eg divide the number by 255 to get CU %):

Now common in both Enterprise and non-Enterprise tools, this is incredibly useful during a post-install survey. Being able to identify signal strength to AP's without the need to tie a BSSID back to an AP is much easier, especially if your AP's are named according to location. The name of this IE will depend on your vendor: