I highly recommend the Zeiss Victory PRF. It is the quickest rangefinder I have used so far. You can also hold the button down and it will give you consistent, accurate readings over and over again. This is good for double, triple and quadruple checking your yardage before the shot or ranging game on the run. You'll find that 600 yards is cake with the Zeiss; it's capable of much farther. So, if fast readings is what you're after.. Go Zeiss! It's faster than Leica and Swaro, and believe it or not, the glass is also better than those two.