I don't know if I would recommend the 9120 at this time.
Backstory: We have dozens of 3702/2702s in production in my environment but with the release of the 9800 Controller, Cisco pushed us in that direction over the AireOS product line. We adopted the 9800 Controller architecture. At the time of purchase, the 4800s were the only APs available but we didn't like how heavy they are. These things are bricks. We were worried about mounting issues and possible hazards of it falling if not mounted properly. Then Cisco pushed us to wait for the 9120s... but they have been problematic thus far.
The main reason is that our organization still has MANY Windows 7 laptops (both Dell/Lenovo). There is a push to get employees to go to Windows 10 but when you're dealing with offices globally in nearly all countries with employee counts in the XX,XXX thousands, it's a lot of work. We use a standard image that's pushed out to all our PCs/Laptops. What Cisco TAC eventually found out (actually earlier this week) is that if you're running Windows 7 and running a specific set of NIC hardware, the AP will not visibly detect any SSIDs unless you either upgrade the NIC drivers (not available on all NICs) or upgrade to Windows 10.
So offices that we've already converted to the 9800 WLC/9120 AP Platform, we're trying to scramble to get things fixed.
I suppose you can say it's our own fault for not researching enough, but in our defense when you have a aging legacy AireOS infrastructure, we weren't given many options. But I won't elaborate on that.
In hindsight, I wish we would have stuck with the 4800s.
