I have been using car chargers for a long time now but this one is by far the best one which I've come across.
Most chargers are specific to one type of device e.g. android / apple and can't change between them let alone charge both at the same time.
I can charge my android smartphone and a colleagues iPad when I'm in the car at the same time! Couldn't be happier.
I drive a vauxhall astra and the fit isn't lock tight but it's rigid enough and no natter which way I put the adapter in charging is never stopped / interrupted.
The only thing I could say negatively about the product is that it doesn't come with cables to plug your device into. This isn't an issue as you can simply use the usb cable that your device comes with.