I ran a comparison on one of the sites accepting preorders for these new Whistler models. I noticed that the XTR690se has 2 features that the Pro78se does not have. The 690 has the 72 point compass, the vehicle voltmeter, 9 levels of user selectable dimming. The Pro78 has the intense blue display, 3 levels of user selectable dimming and auto dim feature. If you don't have a preference for color, the XTR690se appears to be the better value detector. All other features for both detectors are the same.