The storage capacity of 32 GB, at least quite sufficient for me, there are real 29.7 become with me.
The loading speed is compliant to USB 2, in regard to the future would be safe USB 3 has the better solution and that there now being expected for some time!
The plus of course the mini USB is needed for the smartphones, tablets etc.. Here but you should definitely check his Smartphon compatibility because it only works with Androit with OTG. For this you can then download a free app and off you.
To check the compatibility of fixed Sandisk provides a link to the one usefully use should be before At length the Stick ..
Although I have currently not own Smartphon but so I can download photos of my daughter just from their phone now and do not have to take a detour via mails etc..
I'm happy with just the small restrictions.