:) Understandable, just wanted to mention it since I am a fan of Toxic Boost/Zangoose with Feint.I've been using Mega Pinsir a lot and I've usually found power to be more of a concern than Speed when using Quick Attack. Might be worth trying for certain situations, but overall, I'd say beating priority from Pokemon with over 105 base Speed is a small gain for having to give up a quarter of your power.
Of course, piercing Protect isn't too shabby either, especially if you're having trouble with something like Toxic Stall Gliscor.
Also (in regards to Hyper Cutter/Moxy).. according to Serebii's Speed Priority (have yet to try this myself), "Mega Evolution has a Speed Priority beyond Stage 5, and will always occur at the start of battle before anyone attacks or switches". Unless Pinsir is Lead PKMN.. Hyper Cutter is not doing much if you decide to Mega Evo it "right away" (someone saying staying Pinsir is not worth the risk).. Pokes cannot Switch in fast enough to fail to Intimidate VS Hyper Cutter.. Aerilate will be ON by then. Moxie would offere more benefits IMO.
* BTW, what the **** is 4MSS??