I bought one last year. Let me tell you what it really does because I think the advertising is a little confusing or tricky.
I bought it and sold my 1200 because I was wanting a rangefinder to tell me the true ballistics. The 1600 does do the calculating for you BUT it does not tell you the true distance on the reading. After programming your rifles ballistics into it, it gives you a hold over or under depending on the angle, temp, pressure, altitude, etc. That's great and all but not if you have a custom turret on your scope set for each yardage. I wanted the true distance with all that calculated, not hold over, so I was a little dissappointed. Still a great rangefinder. I ranged an elk on my brothers hunt at 1405 yards. Compared to the 1200 it does take a little bit longer to give you the range due to the calculating I assume.
When they come out with one that just gives you a true ballistic number I will be biting.