Although I own several different types. Leupold is regarded as being one of the best. If not the best. I am a fan. But I do believe they are over rated. I only say this because. I believe the bushnell ,3200 , 4200 the burris fullfield's and just about any of the nikon line up are as good or better than leupolds. Especially for the $$$ But you sure can't beat the no hassle leupold warranty. I have never owned a Kahles, zeiss or nightforce so I can't comment on them. I think any of the optic's ranging from $250-$400 are tough to beat IMHO!
Dave.