The Flexi-Drive GO series is Sharkoon's collection of flash drives for the common man, but the company also has some models for people who only want the best, and have the money for it.
The Flexi-Drive Sprint Plus series is the “tame” one with capacities of 16 GB, 32 GB and 64 GB.
Its transfer speeds reach 190 MB/s when reading and 40 MB/s when writing (20 MB/s on the 16 GB unit). The USB 3.0 SuperSpeed interface allows it.
As for the Flexi-Drive Ultimate, it is a flash drive with a capacity of 256 GB and, by virtue of its higher number of flash chips (and, thus, higher number of data links), a transfer rate of 250 MB/s when reading and 150 MB/s when writing.
The price of the Ultimate is 279 Euro / $279-358. Check online retailers for the rest.