I've had two Vortex RDO's fail me. One on my Benelli SBE2 the day before a turkey hunt, the other on my carry pistol. As a result of these failures, I would not use one of their products if they paid me. Sure, they have a good warranty, but what good is that when I'm shooting 4" left with 12 hours until the season opens.Any thoughts by on the vortex defender st red dot? It’s held up so far on a turkey gun. 3.5-3 inch 12. Not a 410 fan. Is moving up to a RMR or an Aimpoint durability wise warranted?