I've never used an aperture on a handgun but on a rifle I thought that they were not very good in low light or trying to find game against a dark background. I really like the reflex sights on my handguns (Vortex Venoms) and I turn them on when I start a hunt and leave them on till I'm done. Over three years on one battery on the oldest one. How anything will hold up on a 460 is anyone's guess. I would say go torture it and find out.

Wait a minute, your packing a huge 460 and you think the Burris is bulky? (Sorry, just couldn't help myself.)