I was checking out the 8x42 and 10x42 binocs this weekend down at Simmons and was pretty impressed by them. How well do they perform ad dusk and dawn? I've got a pair of the compact Pentax binocs that I use for bowhunting but want something with better light gathering performance when I'm gun hunting. Now that my Pentax are in need of repairs (seeing double images) because of a minor bump I'm also concerned about durability. Are the Monarchs as tough as they feel like? It's one thing to have a $50 pair from Walmart mess up on you but for $300 I'd expect withstand at least some abuse.