I had about 6 cars window tints and never had any problems I did by the way contact Motability insurance and Motability Op before having them fitted and remember you have to pay for retinting if a window broken, I for the first time have not tinted my Mini as I paid extra for factory rear tint which Looks great I am not sure yet whether I will have extra tint but as my car is legal I feel better about this I did used to have a light smoke on fronts but although it protects against uva and looks better It is still illegal according to the law. There is a way around the legal bit is to have the newer chameleon window tint which you can even have windscreen done as it lets in over 75% light and you can have various colours it looks a bit Rainbow like, it is more expensive though and it is hard if you have front windows and win screen done to see you, obviously you cannot have the dark tint in this I was quoted around £400 for front windscreen and two side front windows which I not too bad and the company Has done my previous tints so the are very good.