I did install those drivers, and my Mac sees the device.
It sees the device but it needs those drivers to communicate with bfgminer - if you're running 10.8 or earlier the cgminer and cpuminer should work for you without, but on 10.9 there are conflicting Apple written USB Serial drivers so they won't without unloading those like this:
kextunload -b com.apple.driver.AppleUSBCDC && kextunload -b com.apple.driver.AppleUSBCDCACMData && kextunload -b com.apple.driver.AppleUSBCDCACMControl && kextunloadSystem/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBFTDI.kext
to restore them you then restart or run the same command replacing kextunload with kextload