You need the "displaylink" driver to drive the external video screens and a driver to run the LAN port. Otherwise the device is a USB hub. There doesn't appear to be a "displaylink" driver for MAC IOS. Toshiba appear to primarly be a Windows notebook manufactuer so it makes sense that they might be reluctant to support dynadock for Apple.
I just got a new Macbook Pro (new late 2014 model) and am running the new Yosemite operating system. I downloaded the new displaylink drivers, and this docking station made the transition from my old PC very seamlessly to my new machine. Only the one USB3 is connected to my laptop, and I am running two external displays AND using the laptop screen as my third display. Wonderful product!