Daperl,
You may be happy soon ... to be wrong

I don't think i'm sacrificing quality because i get a lot more details in final video on my N810 than with the usual 400x 240.
Upscaled 640x352 looks a lot better than upscaled 400x240.
The upscaling performed by the tablet is actually quite good, for such a device, it's not just pixel demultiplication, there is some real time treatment here. And it's efficient.

So why stick to a quarter screen definition ? When you watch a DVD on a full HD screen, do you keep it at original size ? Probably not, you upscale it, and, depending on your DVD or BlueRay player (or your screen too), upscaling can be very ugly or very nice ... thanks to the treatment ...

If i didn't mention black band cropping, it's because i think it's obvious. My source was a HD video file and the encoding software proposed me to keep the original aspect ratio. So i didn't distort anything.

You can probably test it by yourself very easily : go on itunes website, download Ice Age 3 trailer in HD, compress it with the parameters i gave in this thread ... and see by yourself.