Generally works well, occasionally requires a re-load
I have a 2012 11” MacBook Air with tandem (side-by-side) lightning displays at work and at home. When Brightness Slider initially loads it controls all three displays (laptop and two lightning displays) uniformly. But when I pack up and go to work or home, sometimes one of the two remote displays stops responding. It’s easy to kill and re-start the app to make it work again, but I’m spoiled…everything else works perfectly with windows resuming their correct positions, etc. (at least when running Mavericks), so small hiccups — like a non-responsive display and the need to reload an app to fix it — surface as my most annoying computer issue. Net:net I love the app, save this single annoying bug.
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Brightness Slider