I did M Engineering Stage 2 - I have catless downpipes, x pipe, and BMC air filters

Speed: Stock I couldn’t break my current tires loose, now I can easily. Highway pulls noticeably faster, haven’t collected any times yet. Supposedly up to 720 crank hp (660-670 whp) and 585 lb ft from 570 crank (530 wheel) and 460 lb ft.
Feel: Overall much smoother driving experience.
Burbles: I love them, sounds like thunder, not like a BMW burble tune. And you have the ability to turn them off with the map switching.
Shifts: It does the whip crack on the shift like a 600LT now, and much louder ones too. Flames easily. This is the best part.
Customer service: Pretty good, calls back within a reasonable amount of time if they can’t answer. Emails back within 24 hours consistently. Got ECU back to me in less than 48 hours after shipping it out.

Via /r/mclaren on Reddit

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McLaren 570s w/ Soul Performance Downpipes & Exhaust, M Engineering Tune, Weistec bov & 1221 Wheels

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"Flawless"

Timnineside via Rennlist

They did my 570s and it was flawless. New owner beats the living hell out of the car and it just takes it. I plan to have them my 720s soon here as well.