I have the Leica 1200 and it works OK. Against real reflective objects, I've ranged stuff out to 1167 yrds. However while in Wyoming hunting antelope, I had a bitch of a time ranging antelope at 500-750 yrds. It just wouldn't work. I finally got a range on one at 709 yrds, but it took about a dozen tries. You just need to get lucky and bounce the beam off the white part of the antelope. But it certainly is frustrating to see a real nice buck antelope at somewhere between 550-750 yrds, and not be able to adjust your scope properly because you can't get a reading on your laser.
What Darryl says above is really true. I missed my one shot at a real big bull elk in Wyoming (see posting about hunting elk in Wyoming) because he was standing on a hillside at about 550-650 yrds right at the edge of a fog-bank layer. He was about to dissappear up into the fog. I just couldn't get a range on him because the residual fog was just reflecting the laser too much. So I lased a cow in front of him, standing on the hillside at a lower level and tried to calculate the range to the bull based on how far he was from the cow (big mistake - that's very hard to do at say about 500 yrds, especially when they're standing on a hillside). Whereas if I'd had a proper laser I'd be eating a elk steak right now while writing this to you.
While we're on the topic, I've got a question for Darryl. What is the approximate size and weight of the military Russian lasers? Any idea on where any are available?
Be sure to get all the laser you can. I can tell you I spent sever thousand dollars getting my out-of-state elk license and paying for my outfitter. Not to mention the money I paid to get myself and my gear to and from Wyoming. All of it was for nought because I didn't have a good enough laser. Oh well.