These look cool. Not sure what range they have but I know a guy at work who would love one, He is always jumping out of the office into the carpark to watch planes go over as he has an app that pings him whenever there is something nearby. Last week it was a bunch of ww2 spitfires and before that it was one of those weird jumbos with a big round radar thing on top. He would buy it, but not sure who else would.