Looks like this topic matched the thing i want to say about, so i'll not create a new one.
I use AOSX V1 on my Xperia P and it performs good except of two issues:
1) In some apps (Personal Eye System, Autodesk SketchBook Mobile, Heroes of Loot Free) i experience display issues like that:

2) While updating/installing a large app, a force reboot (or error -24) is possible.