A few friends and I were shooting prairie dogs and between the four of us we had a Leica, the new Sig Kilo and my G7 rangefinders. When the shooting slowed down in the afternoon we started playing around with them to see how they compared.
They each did a good job of being able to pick out prairie dogs to 600+ yards when held steady enough and never varied more than two yards between them on the same target.
When we started ranging cattle the Leica began to struggle once the distances were over 800 yards. It would usually take two or three attempts to get an accurate range and a few times it failed to give any distance. Both the Sig and the G7 did very well to over 1100 yards as long as they were used with a steady rest and still gave results within a couple of yards of each other. We were ranging cattle in tall grass, behind or next to small scrub brush, in front of tree lines and over small rises, in each of these scenarios all three did well until the Leica started having a hard time on the longer targets. For hunting I think anyone of three rangefinders would work great.
When we started ranging hard targets to see how far we could get a return I was surprised that the Sig came in second to the G7. It may have been because none of us had a lot of experience using it and that I have been hunting with the G7 for better than five years. The farthest range the Sig was able to return was a metal barn just under 2000 yards and the G7 was able to range a water tower at 2600 yards. It would have been interesting to see where the G7 finally gave up but we couldn't find anything farther than 1 1/2 miles to try the rangefinders out on.
I think if I were buying a rangefinder today I would really have a hard time not picking the Sig Kilo 2000. It doesn't have the ballistic computer of the Gunwerks LRF but it's less than 1/3 the price and you can carry it a shirt pocket while the G7 is almost as large as my binoculars.
I'm still a fan of the G7 and have no plans of ever replacing it. I have a confidence in the range it displays and the shot correction it calculates. Plus you can program five different rifles into it and easily switch between them . Even with all of that I think I want to buy a Sig rangefinder for the times I don't really need the capabilities of the G7.