Lucky me I have no burn in problems as well (unless I just never noticed them lol).
What somewhat irritates me now though are the vertical lines you see when viewing solid color images. Is this an oled thing too, or just specific to the vita because I don't see that on my amoled phone (I get the splotches on both phone and vita).
I thought that was just the way Persona 3's Tarturus clock looked like. Also, I don't think holding off on a Vita is going to fix much of anything. They'll keep using the OLED screen and Mura will happen just like with every other OLED screen ( Hopefully I'm not wrong am I ? ). And burn in will happen with every device you have. Might as well not buying anything with a screen, then again that's just my experiences...
Wait a second... My Droid Incredible was OLED too... Interesting.