I have a lot of AnyConnect users on my ASA 5520, and the licensing cost is pretty hefty for an additional 500 users. I found out that the 8.3 version of the ASA has a special license that lets you have pretty much unlimited AnyConnect users. Its called AnyConnect Essentials. It costs a few hundred bucks so I think I would like to try it.
My only hesitation is the upgrade from 8.04 to 8.3. Has anyone here done that upgrade? Will I need to change my config at all? Are any commands deprecated? Advice? Warnings?