I'm getting ready to buy a new scope and narrowed down my choices within my budget to either a Vortex Diamondback Tactical 6x24x50 or a Sightron STach 4x20x50. I have 2 Vipers now and like them a lot, and we have Sightrons on our club guns that our junior shooters use at the steel bench rest matches. Does anyone have any experience with the STach? I hate to buy something without actually seeing / touching it before I cough up the cash. Thanks for your opinions as always!!