works great for me, no conflicts with the last beta either ( it makes a new vehicle folder and rfm ) The UI stuff only gets used depending on your last mod loaded before game exit, or an install of ( some ) new mod. I had no problems with FSONE.
Alternativly, run the FSONE setup program and point the install to a new, empty folder, it will simply extract the files as they would be in your rFactor folder. Simply copy the new folders to your rFactor folder as you would with any other mod. ( run the uninstaller and it will clean out the new folder )