Summary: I agree with some of the other poor reviews this product has. I didn't actually buy this from Apple. I bought it from a retailer at the service stop along the motorway as I'd forgotten my charger. It was used about 5 times within the first 3 months of buying it, then it just stopped working or lighting up. If you take the risk and buy it from Apple, you should get your money back because of their receipt system.
Summary: I thought buying an in car charger from Apple would mean it would be decent but this car charger doesn't even fit in the socket! My sat Nav works fine but this is awful! I don't even know if I can get my money back as I am applying on 18 th day as it took ages to arrive and i was on holiday.
Summary: I purchased this as i'd tried others had they did not work. Contrary to the other reviews this has worked great for me. I tested it with 90% power and whilst watching a movie and browsing the internet after 30mins it was 100%. I think the problem may be with the cars charging point, some cars don't have enough juice going to them.
Summary: DO NOT buy this to power the iPad in a car. It struggles to give the required juice. I have had two (first one burned out after trying to charge iPad for 4 hrs without a full recharge). Second one struggles again and so give up. Just use it for the iPhone. Hope this helps so that you don't buy another charger and so waste the money on the hope of charging the iPad when on a long journey away from an electrical supply! P.S.