I have one, it got so hot that the batteries blew and leaked. It no longer works on batteries but it does work when plugged in. I would not buy another one. I also have the escort that does not use batteries it is a much much much better unit. This is just for your information. I hope it helps.
Don is 100% correct, I had a battery Escort that toasted the batteries too. It was still under warranty and I sent it back to Escort. The customer service rep was really nice and since the original was toast he offered to send me a 12 volt unit that plugs in to the lighter or power outlet in the car. (He kind of recommended it...) 5 years later it still works like a charm.
After reading the posts on the Valentine I went to their web site and was impressed with the unit. I ordered one for my wife...the locals are cracking down hard here as tax revenue is down and they patrol the side streets with Ka band radar. (I'll give it to her for a birthday gift this month...) One saved ticket will pay for the unit. (Tickets are $150.00!! Plus court costs plus driving school if you want the points off your license!) I'll report back on the forum as to the units effectiveness and how we like it.