User blog comment:Rupert Giles/Product Testing on Wikia/@comment-24529081-20140219220713

Is there any way to make this testing a per-user setting? I think that's the best approach, any user can opt-in or opt-out of the testing groups whenever they feel like it. Outsiders should still depend on the particular wiki community's decision, I guess.

Personally, I'd opt-in, I like this kind of thing.