Hi all. I was shopping at best buy a couple of days ago and decided to look at the radar detectors. Of course, they didn't have Valentine Ones but one caught my eye. It was a Whistler 911, a relatively small unit that claims to offer x,k and ka protection as well as radar. It retails for $40 or so. Has anyone had any experience with this one? Is it worth buying? Useful at all? TIA Kyle