There are websites that this method breaks - one in particular thinks I've disabled cookies when I use this. Also, I couldn't share a video from the TED app to facebook until I disabled ABP. It also wasn't blocking ads in some aps eg File Manager HD.
I've had to uninstall it. I don't want to root my S4 (GT-I9507) as there are certain apps I want that won't work on a rooted device.
when rooted, I was running AdAway - a brilliant, easy solution, pity I can't use it un-rooted