So I'm getting a really good deal on a 3rd gen Apple TV. Literally for £40. I've never owned one before and I use my Xbox one as the main entertainment system at home. My requirements from Apple TV is really more related to being able to airplay and mirroring. I know that shouldn't be a problem but is there any other significant improvement on the 4th gen for me to cough up another £100 to get the latest model? Also, has anyone tried to play games on either iPhone and iPad while mirroring it to through the Apple TV? Is there any specific lag or anything else I should be aware of?