I had it on my previous 550 and I loved it. The tune is designed to maintain the OEM power delivery feel. It still feels like a 550 just faster and more effortless.
It is like BMW should have designed the car this way in the first place.
It's a must in my opinion for any 550 owner.
2014 Porsche 911 Turbo S
2015 Mercedes C300 4MATIC