Has anyone heard much about Sage Dynamics? They're going to having an active shooter course in my area in a couple months, and the premise sounds pretty interesting, as it's a force-on-force class held within the confines of a large facility, which is something that as a civilian isn't easily found. However, the whole active shooter thing seems a bit Walter Mitty to me (especially for a shut-in like that me that shuns public areas), and I've read many times on here that force-on-force can be pretty difficult to do right (the balance between realism and just setting up players for failure), so I'm approaching this with some caution.
Here's a video: