i can guarantee that no other radar detector has a rear facing radar detecting antenna. others have rear laser detectors but no rear facing antenna, i will guarantee this. that is why they are $400 new, not because of a gimmick but because mike valentine(who co-founded escort) has the patents on a rear facing radar detecting antenna and the arrows. any radar can pick up erronious radar signal from over a hill and around a bend, the reason v1's are good are because say.....you are on the highway you pick up a cop beep beep beep and so on, you pass him and the signal gets weak so you start to speed up then bam another cop is sitting ahead and instant ons you, your screwed, now with the v1, itd tell you there are two radar, and after you pass the first cop the v1 will point behind and it will also point ahead to the second one that is instant onning other people, picking up both radars so you dont get caught in the trap of the second cop hiding in the radar shadow of the first one. id like to see any other radar get you out of that predicament as easily as a v1 can