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.
Mike here is mine installed on a 320i for reference.
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