I got the "Ultra" version with 16GB memory sticks bought this because it was cheap (about 9) and I need it only for archiving. Care, this USB3.0 Stick (measured on two computers and various test programs, eg h2testw) only write rates of 20 MByte / s.
In addition, I have also bought the higher quality and more expensive "Extreme" version of this USB3.0 sticks with 32GB. This cost per GB of memory as much as the "Ultra". The "Extreme" However, in my tests achieved write speeds of up to 100 MByte / s (just measured by h2testw on Windows 8.1 Notebook). I'm thrilled!
So if large amounts of data will be copied to a USB 3.0 flash drive frequently, which saves time, if he opts for the "Extreme" version of the sticks.