Has anyone resprayed their bumper before? Question inside

Does it chip easily? I hear conflicting things. So instead, I’d like to hear from people who have done this.
I’m considering going with the RS4 front end and will make use of the extra front airflow to duct air into the front wheel wells (for brakes). However, the bumper is unpainted and I’m worried that it’ll chip to oblivion 'cause “nothing is as good as OEM paint”. Though of course, I know nothing about paint, so I do not know the validity of that statement.

http://www.bimmerboost.com/images/imported/2012/02/RS4Ab2-1.jpg
these things!