When I tried to burn a DVD on my MacBook Pro, which had one of my label designs stuck onto it, my DVD drive started doing the most disconcerting thing. It started making a crackling effect and when I pressed the eject button, the DVD would not come out at first. I had to hold on to the eject button for ages before the DVD would come out.
The same thing happened when I tried the DVD on the built in DVD player on my TV at home. Both of these DVD drives consisted on a slot to slide the DVD into, which leads me to believe that a labelled DVD can only work properly in DVD drives that have a tray which comes out and not DVD drives with slots.
This means that I am going to have to make do with distributing my showreel on DVDs without my personalised label.