I have a Leica 900 LRF Scan that is hands down without question the best rangefinder that I have owned. I tried going the less expensive route and I sure got what I paid for. I actually bought this one used from a friend that took it on one elk hunt and than he received a 1200 as a gift from his kids so he sold me the 900 for a great price I could not turn down. I will never own any other rangerfinder as I believe these are the best on the market now.
You look throught the eyepiece push the button and it tells you how far away the object is... plain and simple.
I would prefer the 1200's but I cannot see where they would do any better than the 900's I have now. Whichever model you decide on you will not be disapointed. That's my .02's worth.