I am fairly new to Apple having been a windows user for many years. My Macbook Pro is a Mid 2012 with OS X Lion 10.7.5. I recently purchased an Apple TV only to find Airplay (Using PC in connection with the TV) will only work effectively with Mountain Lion 10.8. I was disappointed that Apple would not allow me to upgrade free as I bought the machine over 30 days ago but that said I am prepared to pay the £13.99 to upgrade. I have read various reviews from people who have had major problems after upgrading. Can anyone advise whether upgrading is sensible and if so how can I avoid problems with software after updating.