I have:
VIPER PST 6-24x50 FFP MRAD EBR-1
VIPER PST 2.5-10x32 FFP MRAD
VIPER PST 1-4 MRAD (X2)
Ranger 1000 LRF
I had and sold a Strikefire and a VMX-3 magnifier.
Quite honestly I would not be able to put that many optics on that many rifles without buying vortex.
All of my optics ave even and accurate adjustments, They track perfectly, and their reticle seems to be accurate and matched the turret adjustments.
I had one RMA where I dropped my 2.5-10 and bent the turret... Vortex repaired it free of charge, and it zeroed and tracks properly since the repair.
Great warranty.
Safe bet and good value for money.
I could not be happier.