I picked up a pixel tablet in lieu of upgrading my p6p to a p8p. It was mostly due to cost (tablet is about 1/2 the cost) and what felt like a pretty minor incremental upgrade. I can now use my tablet for all my reading, emails and even messaging (thanks to beeper). So my p6p is being used a lot less and I can the p6p's useful life by moving much of what I would have used it for.... To my tablet.
Of course being able to run GOS on the pixel tablet makes it even possible.
I did try out the p8p and did think the display was better. Being flat over the curved display of the p6p was a big improvement, and while the p8p felt slightly more responsive it didn't really have enough of an impact on what I use a smartphone for. Hopefully the next upgrade will offer a bigger jump while offering a smaller format.