I've gotten stuck in the situation of not being able to boot (reboot or cold boot) into a working system with the fix installed. Performance is super sluggish, and Finder will not open. I had to uninstall the DL driver. Right now I am using an old Atom motherboard hackintosh attached to my second monitor and using ScreenRecycler (
http://www.screenrecycler.com/ScreenRecycler.html). For mainly static content (looking at code, windows that dont have moving content, etc. it works a bit smoother than the USB-DVI option.