I found that the flip case cover was quite chunky and a bit annoying when trying to make or recieve a phone call as the flaps of the cover flip up to your mouth and the little magnetic catch folds itself over the phone speaker. To make a call properly you have to fold the flap back and bend it to connect with the little magnetic catch so they keep each other out of the way. It does come with an adhesive screen protector which is the best part of this product and is really good at protecting the face of the phone, but these can be brought seperately for a fraction of the cost of this product.
The car charger is just a standard charger that plugs into the cigarette lighter. It says on the charger that it is compatible with a K750 and K750i but as with most Sony Ericsson kit it will still work with any model.
All in all the case is just a bit annoying really. I still have it just in case I think I might need a bit of extra protection for my phone, but just day to day the adhesive screen protector is more than adequet and I would recommed just picking one of these up instead.