Good for mobile data access, bad for large files

I have been given the stick 2 years ago and since this week is nothing. The drive can no longer format, each operation is completed with an error and the data is still on the stick.
Pity, because I had him always on a key chain and so could always transfer data from another PC on the stick, without having to rely on Internet. It must be said that he is really slow (see other reviews). Large files such as movies take forever to transfer, only for smaller data such as documents is the speed in order. I would not buy this again stick itself, rather even a smaller one with a better read / write rates.