Well, after using the Ridata USB flash drive for several weeks, I have to say that it is quite poor in performance as compared to my old Kingston flash drives. Reading and writing is slow. When you drag-and-drop files onto it in Windows Explorer, there's a 1 to 2 second lull where nothing seems to happen before you see the animated files flying between folders to indicate a file transfer.
A Pictureshop customer lent me his 8GB Sandisk USB Flash Drive a few months ago. That one was just fantastic in performance. I'm sure it costs an arm and a leg too.