Comment 2 for bug 1412937

I think a per user option is great for the single user case.
However, I think a machine option would be better for the business/school setup. A specific use case:

You have a shared /home setup and many users.
Server A is a powerful terminal server that has an accelerated display but since it's going over RDP, etc the transition are wasted and make Unity seem laggy and unusable. We want to disable as many affects as possible here.
Computer Lab B is a Linux lab where those same users with the same profiles can use to do daily work, etc. It runs Unity on full spec totally flawlessly. They should be able to use it there.

A per-user solution would have us as administrators need to modify each users directory, change the gsettings, and then basically disable the effects across the Server A and Computer Lab B.