Hey folks I recently bought my rMBP and i'm amazed with the USB3. The R/W speeds are way more faster the USB2, transfers between mac and HD (also HD and HD) are pretty quick and i love (who doesn't) files being copied quicker. And now, since i have an mid2011 21.5 iMac, i'm looking for the best way to add some USB3 ports via TB. And when i say best, i mean the cheapest and the one with quicker results as possible. I thought in 3 options: 1. A thunderbolt dock like the Caldigit Thunderbolt Station (belkin has a dock also, but the USB3 ports are 2.5GBs) 2. The sonnet express card adapter + USB3 express card 3. I think this is the fastest option (but it might be the more expensive) a PCIe thunderbolt interface + USB3 PCIe card. About the thunderbolt docks, i would like to know from people who got one of these how slow the USB3 speeds from the dock are, compared to USB3 ports from their macs.