cjoseph's antwer will be technically the best answer, but I'll add this:
Airwave enables me to manage and monitor the configuration on 2,903 devices withoug having to go find help.
We have 6 controllers with 638 associated APs, and we have 130 iAP clusters of 12-16 iAPs each and a few thousand clients roaming past them all. I can see which access point has too many clients and which location is having DHCP problems - all from Airwave.