i personally have never used it and i honestly prefer usb 3.0 over the thunderbolt port, because you need to buy the wire and no one i know uses it.
Beside the simple thing that 8GB Flash sticks usually don't even need USB 2.0 speeds. And the fastest are still far away from needing more than USB 3.0.I would love a thunderbolt memory stick. Except it would be like 100% for 8gb of flash.