these are garbage from what I hear. I have played with them in the stores quite a bit and even tho I'm a techno geek of sorts, I was unable to figure them out without an extensive reading of the directions and even then it took three visits and i still did'nt totally get it. TOO COMPLICATED TO BE OF REAL USE!!! I have also heard of problems actually getting a good lock and range reading in the field and at range.
on the other hand LIECA is making a really nice couple of compact LRF's 900 and 1500 iirc. pricey, but leica has been the industry standard for sharpshooters for over a decade. they just plain WORK. no fancy do hickeys and features, just accurate range readings. if you need to shoot uphill or downhill, then remember ALWAYS AIM LOW. An angle co-sine indicator on your scope will give you a quick reference for how much to compensate, if you really need the prescision.