If you are going to be trying to range Prairie Dogs/mounds, don't be surprised if you don't get the results you are hoping for, regardless of the laser type range finder you choose...I have a Leica 1200 and it's pretty iffy without a solid object for a reflection..
The mounds are pretty flat most of the time and there is not a lot of reflective surface...I usually wind up finding a rock or large cactus to get a general distance and any real measurement usually involves walking out to the location of the shot and ranging back to the vehicle/setup...
Most laser range finders are pretty accurate, if you can hold them steady enough for them to register a return reading and work great out to about 60-75% of their advertised rating, then you have to prop them on a solid base to give them time to stabilize for a good reading..
The farthest I've been able to hand hold my 1200 and get a solid reading was 954 yards and that's a lot farther than I will ever shoot at anything...