yes, i use it often...yeah sometimes its off but most of the time its not off by much... it does say on the page its not a perfect system.. also use the colors of the public event to help you choose ....green the surest thing....i use to not see alot of them, but then i made sure i was in the location 2 mins early and havent had much trouble since...i just farm chest while waiting and bounce from area to area...