I don't see any differences in either rebuild or new. I have a 180g that was my first new one back 2 years ago that I pancaked in a f-18. Didn't send it back (wrong move) and on the 5th flight it spit the rear blades out of it. Dirk rebuilt and I flew it in a couple of different airframes and now it's in my Skygate Hawk and is racking up flights. I have about 30+ in the hawk and it is flawless. Hoping to upgrade to a 210g over the winter.
I have had a full crash and a 25 hour Kingtech turbine along with the one I described above serviced and I feel like once it's factory overhauled, balanced and tested there really is not any differences.