I have used 1 pen drive and 2 memory cards from Sandisk. And its been 4 years for my 32gb pen drive which is still working fine. without any data transfer speed loss. And also they have there software Sandisk secure which is really very helpful. It comes in pen drive itself, it protects from the unauthorized access to the data which makes the data secure.
There is no hassle of installing any drivers or software for using it, it comes with a simply plug and play mechanism.
My 32gb sandisk pen drive is ultra light and pretty small which makes it easy to fit in wallet.
Also the build quality of the pen drive is nice. same with the memory cards they are very reliable.
Overall its value for money product and will never think to opt for other brand.