I'm sure all it will do is lock the system some more, like already MJ7 does, compared to MI7 which I have, also probably will get rid of permission settings which I use now and yeah, improving performance on 512MB phones now, when most makers going toward higher memory options, ain't that great? My phone runs good, battery is great, so I think I'll stick to "Don't fix it if it ain't broken" motto for my own good. I updated my old GS3 to 4.3 recently. The only difference I can see is that useless, stupid Knox now loaded on my phone, lesson learned, thanks.