So far so good here. I'm sorry to hear about the problems folk have had trying to download and install over 3G. Mine went through shiny on my stock D3 without any misbehaving.
So far, it feels much faster, quick to respond, and the camera images have lost the blue tint. I can't speak for battery life, but I've been using Juice Defender, and have a BF6X extended battery on order all the same.
All plus and no minus from what I can tell after a couple of hours of my normal heavy use.
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