No idea if there's a "master factory" for all new CV axles, but I picked up a MasterPro unit today as my local Oreilly had them in stock for around $70.
Of note:
30mm shafts vs OEM 27.5mm
More material on the tripod joint. They are round and not diveted like the OEMs.
The outer CV is of a slightly larger OD than the OEMs.
I have no binding issues at full droop. When I was doing the washer trick on my shock mounts I ended up with just a small amount of resistance on the tripods with the suspension hanging. That is gone with these. One less stress point.
Anyone ever bother to measure/compare their Cardone's to OEMs (other than the boots)? If Cardone's are exact OEM copies then I'm more than happy paing the extra $10 or so these cost me.