I was a dyed in the wool leupold fan for many years, nothing else would do but i took the risk on a sightron SIII 8-32x56 target dot back in 2009 because i wanted more mag then leupold could offer.
I now have two Sightrons having purchased a SIII 6-24x5o as well.
Optically they are a bit better then the leupold and not as critical on the eye relief, however IMO they are not quite as well made.

TB.