I have a Leica Geovid, the SIG Range finder/binos and the Revic BLR 10s... My Leicas have the best optical clarity, but I've had issues with the rangefinder on non reflective targets (big game animals) and I have had issues with them ranging in inclement weather... The SIGs have ranged pretty well for me, but the optical clarity (IMO) is okay, but not the best..
Personally, I prefer the REVICs BLR 10s .. the rangefinder has been incredible on non reflective targets and I've honestly ranged bears at distances in excess of 2,000 yards.. my leicas have difficulty ranging beyond 1,000 period...
I've also used the rangefinder only units for Leupold, Bushnell, etc. and am not a fan.. just my two cents worth from the cheap seats...