On a recent hunt I met a gentlemen whose son worked at Leupold. He had a pair of windriver binoculars with the built in rangefinder. They were real nice.
Optics were clear and crisp-much better than i would have thought when comparing them side by side to my Leica's. Having both in one unit is a lot less to keep with than having a set of binos and a rangefinder. When every ounce counts, i would be happy to have a set of these along.