ive gone back and forth with this for a few years. im currently using a handheld rangefinder and a set of binos. the reason i did this is because of the size of the rangefinders and the features with them. with a tether tied to the rangefinder and a case attached to my bino harness its pretty easy to use and manipulate. its all about training and knowing your equipment. having one unit is very appealing and can alleviate some of that fumbling around for the rangefinder, but, the range-finding binoculars arent as bright and clear as standard binocular. i do a lot of glassing with them, as im sure a lot of folks do. so i opted to go the two unit system, giving me a better binocular to glass through. i havent felt as if i needed to combine them yet.