I'm thinking of buying one of these too. Doing 80 miles to work and back every day, I see so many numpties using mobile phones and not concentrating on the road. Was on the A38 dual carriageway when I came up behind a chap in a red van doing 45mph, as I pulled passed him guess what????.....Yup, he was busy trying to text on his phone/ipad which was sat on his lap. I gave him a blast of the horn and shouted out of the window to get off his f'in mobile.....he didn't even see or hear me. As I drove on, all the other traffic was having to pull passed him too, even slower lorries. So, think these things are a damned good idea.