I just spent 9 days in the mountains of central Utah on an elk hunt and was able to run a Gunwerks G7BR2 2500 and a Leupold 2800 side by side. This was not really a apples to apples comparison as they are much different but I was able to get a good idea of the limitations of each. If you are looking for just a rangefinder without all of the other features the Leupold is a great choice. It would not get as consistent readings past 1000 yards on less reflective targets as the GW but I had no problem getting 2300 yard ( this was as far a target as I could find ) readings - often the same exact reading as the GW on highly reflective targets. The Leupold does have angle compensation which is nice. The built in ballistics for different cartridges, bullets and velocities should work well out to 500 yards in most cases but past that I doubt it, unless your velocity matches their calculation exactly. Also the response time is very fast on the Leupold. Aim, push the button and you get a range almost immediately.
The best rangefinder I have ever owned was a Vectronix Terrapin but it only did ranging. The GW RF is a programmable ballistic computer with a built in weather station, angle compensation that works in moa, mil, G1 or G7 and gives shoot to adjustments after showing shoot to range. It does have a separate button that shows windage adjustments in 10 mph increments but I find a Kestrel to be quicker.