I have and my racket of choice is 7G.
7G is slightly more maneuverable and has slightly less power than 5x. I also liked Q+5X Pro. My tennis partners have confirmed that my shots are heavier with Q+5xPro.
But went with 7g as I play fair bit of doubles.
Q+5x Pro just dominates ball at contact and you will most likely not get that feeling unless your 7G is little over spec.
Hope this helps.
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