I have a corded one already in the shop but it's slide switch instead of paddle switch. And I fucking hate it. I like the Milwaukee cordless but I figure at some point I'll forget to charge the battery before class and I'll end up having to run to Lowes between classes and buy a corded one.
I'm just not a fan of super heavy duty cordless tools. They burn through your batteries so fast. For a simple job, yeah its great but for a lot of continues grinding then a cord is the way to go. Otherwise you'll be buying a new $100 battery every few months.