If you want a mid stream thumb drive go with this one it works just as it states it will, fast with both reading and writing.

I used it for more than 4 months and found no issue with write speed and reading speed. it works charmly and i love it.
Finally worth for the cost i spent.

Easy To Set Up; Easy To Use; Fast; High Capacity; Portable; Reliable

SanDisk's latest USB flash drive includes OTG capabilities for Android. Read on as we take a close look at the Ultra Dual Drive.

Rapid delivery of this SD card. Well packaged, and does all that I expected, with robust and well made feel.

It does whats needed Very well.!!