It's definitely a noticeable bump and takes 5 minutes to install or remove. It is unlikely to cause any issues but no mod of this type is without risk. Unlikely as it is, it's without question a warranty issue if it is somehow shown to cause damage. On the other hand with it so easy to remove, even by the side of the road, it is pretty low risk.
I didn't hesitate to slap it on my new 440i but would hesitate to use the more involved devices like the JB4. I'm not recommending against them, I just wanted to keep it simple.
2017 440i xDrive M Sport Convertible - European Delivery March 2017 - Glacier Silver - Black - Ash Grain - M Sport Brakes - 442M 19s Orbit Grey - Variable Sport Steering -
Adaptive M Suspension - Driving Assistance Package - Technology Package - Top / Side View Cameras - JB+