I am a tinkerer, and have changed pickups in many of the basses I have owned. I kind of wanted to change the ones in the amber VMP I have, but then I thought "Why? Just to change them? Is there anything you don't like about the DDs that came in it?".
Can't think of a reason to change them. I did change the bridge to one of the HiMass ones from a 50s CV and I put the Hipshot Ultralight tuners on, but the main reason for those changes was to alter the balance a little and help with the neck dive issues, not because there was anything wrong with the stock bridge or tuners.