They have new erectors.  I run several VX5HDs and VX6HDs.  Fly all over the country with them, regularly dial them out to 1250 and back to my 100 yard zero - never had a problem with them.  The glass on the HDs are phenomenal.  Guys go buy a $400 VX2 or 3, put a CDS on them and get pissed because they don’t track like a $3000 nightforce...eye roll. 
Also important to note - because leupold makes scopes at about every price point, they probably sell a 1000 times for scopes than nightforce or TT etc.  its a numbers game, i bet the same percentage of nightforce scopes have problems as leupolds higher end stuff.