I’ve been running Blender 3.0 on Windows 7 for about a month.
I’ve had a couple of addons not working properly, but can’t say if it’s because of the Win7 hack or, a Blender 3.0 thing. There’s also an issue with volume showing up wrong in passes, but correct in beauty render. I think that’s a Blender 3 thing but haven’t been able to find anything about it.
Beside that, I’d say the hack has been running really well and would recommend you to try it: https://bestofcpp.com/repo/nalexandru-BlenderCompat