About 1K miles now on mine. Already upgraded and working with ZFG on tunes. My plan was to "wait a few years", then "wait till like 10K miles", then "F it I wanna play now". Plus doing a bunch of research that modern vehicles after a few hundred miles have all that they need in terms of "break in". It is more about varying driving habits than anything else for the first few hundred miles. It could all be BS but thats what I decided to believe from reading around the net.
I did replace the oil recently like 900 miles and about to throw some amsoil 75W-110 in the rear diff when I do the steeda brace. There's some research by oil geeks out there that a sub-1K first oil change does have benefits, and I figure with the rear diff stories here it can use some TLC getting that first pass of metal goo off the magnets AND a bit higher viscosity will hopefully help keep her healthy longer term.