By cons, where I am worried about is that by removing the key from the USB 3.0 port it is found that it is particularly hot!
So I have to hope that no nabîme the USB port of my car ...
EDIT 25/10/14: After a 3-hour trip by car the key is boiling!
I will not take more risks, I asked for a return to "malfunction".
I ordered the old version (made cruzer 16gb) to replace it, my wife uses one for over a year and she never heated.