my dad has got one and it is the b****cks. really clear audible warnings.
only thing is, i heard that if ur targeted by a laser its already too late, because the laser is too quick.
i know my mum was using it (another good point, it is transferable really easily between cars), and the laser alert went off. She wasnt breaking the speed limit, but it was a scary warning heh.
Id reccomend a Road Angel 2 if you can afford it mate, also just remembered the customer service is spot on. Dads cable to the cigarette lighter was faulty, he phoned up in the later afternoon, next morning a new cable had arrived. A true testament to a good company.