yeah, I use separate units as well. I thought of duct taping my range finder to my binos to make one unit! Haha just kidding.
I have a friend who has a pair of the Leica Geovids. He actually has two pairs, but he ran the one pair over with his truck! They are a very nice, and like most will agree, I couldn't tell a difference in clarity when comparing them side by side with my Swarovskis. The one thing I did notice, if I remember correctly, is that it took a little bit longer for the rangefinder to shoot a range and a stand alone range finder. I'm not talking about a ridiculous amount of time by any means, just a tad bit longer.