I was a little dubious about this product, however my experience of using it has been excellent so far. The jury is out on long term storage, however this is an aspect of any non-volatile memory that must be taken on trust.
Many people have complained about the lack of a 'light' to indicate the stick is in use, on mine this is a faint red LED which can just be seen through the dark blue case if you shield it from room lighting.
Speed of writing: not remarkable, Case: cheap but adequate, however could do with a 'lanyard' hole.
Overall, you get what you pay for and this represents good value for money.