I recently switched to using FreeUI after using my own built one for a fairly long time, and while I love the sleek look of Aurora that it uses, one of my addons just sticks out:
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh