Thanks for asking Phil. I would prefer MSI's over leaner updates.
Funny the two have become merged - but that's how MSIs work - updates are applied through MSI/ GPO - correct me if i'm wrong somebody? That's how I've upgraded apps through MSIs anyway.
Similarly here to what has already been said. Come update day, I ask all staff to leave their PCs turned on after school. The update is applied, and all machines re-booted. We check if we have time, visit 70 odd rooms, that hopefully we have access to.