I went to their (Leica) website, but the info is sparse.  From what I've heard and read, Leica makes about the best rangefinder.  Some questions -

Does it work at night?
Is it waterproof?
Battery life?
Other than distance, any difference in 800 and 1200?
What increment of range and how close can you get a reading?
What are you selling 1200 for?

Thanks, Alan Bagley

It works best at night.
It is water-proof but not submersible.
Battery is good for over 1,000 measurements.
No difference between the two other than the obvious.
It measures in yards only and is accurate to + or - 1 yard.  That's as accurate as it can be because it does not display less than 1 yard.
$468.95

CF
SWFA, Inc.
RifleScopes.com