Quotation from the editor:
"We know so far no other stick, which is so small that fits up to 512MByte on this equipment. Besides, its high transfer speed is capable to go up to 8MByte/s, as our bench mark tests show. There is really no deficiency, and that's why we have given it 'Best Tester of 6 stars award'."

Click the link for more details
http://www.tweakpc.de/hardware/tests/sonst/z-cyber_proton2/s01.php

Source from "TweakPC Germany"