If you haven't got one yet id highly suggest it. Ive worn mine a good bit and its a stand alone jacket for me when it gets down into the single digits while hiking.
The Leupold sx-4 15-45x60 has been great for me. In my experience Leupold will be clear during the middle of the day but nothing to go crazy about but they pull away from competition in low light. My sx-4 has had great clarity in all lights without chromatic aberration at high mag and long...