I have been able to clock vechicles at distances up to 1/4 mile. I live on a street with a 30 mph speed limit and long 1/4 mile straight run with many speed merchants using it. One or two saw me using the radar gun and abruptly slowed down. :)
Pros: easy to use/accurate
Cons: a backlight would be nice for night use
This review was written in the old system and had content requirements that are different than reviews written today.