There was an article in (I think) Sporting Gun about rangefinding scopes earlier this year. They compared the Bushnell Yardage Pro, a Leupold jobbie and the Zeiss Diarange. They all reportedly did the job.
I thought about going down a similar route but the idea of pointing a (loaded?) rifle at something (somebody?) while you 'range' it, is counter to all the currently taught safe weapon handling rules.
I got a pair of range finder binos instead. That way I identify the target, zap it if necessary for the range and then point the rifle if appropriate. TBH I don't 'need' the things, simply a case of indulging myself with some big boys toys. Unless you are doing some real long range shooting on the open hill a range finder isn't really essential.