I bought this unit because I read multiple good things about it on radar detector forums and when I asked friends they tried to tell me that whistlers were "cheap and wouldn't work good" well all of those people have eaten their words lol! This unit more than payed for itself within the first day of it being installed in my vehicle! It gives unbelievably quick and accurate alerts to approaching Leo's radaring! I plan to buy a second one of these pro-78se's for my fiancé's car as she is always trying to use mine and I've already had my license pulled once for speeding tickets