First Impressions only using epub:
The Screen is beautiful, seems to be cripser and better contrast then the Forma and I would say even slightly better then the Aura One.
I can't see any problems caused by the lower dpi, no noticeable pixelation or combeffects. ymmv
The light on my model is even, no shadows, no halos, no lightbleed, no colored blotches.
There is a slight colorgradient from the wide frame sites "perfect white" to a "smidge of beige/yellow" on the other site. This only noticeable for me on high light level and if you are really, really looking for something wrong.
Data Transfer and Filemanagment is much faster, as expected:
~1.300 files (1.4GB)
Transfer: 190 secs
Database Import: ~215 secs
Collection lists show covers faster, paging through lists is roughly the same speed.
Opening epubs is ~20% faster. Cover images in the epubs have sometimes a delay before they show up on my Forma, but show instantly on the Elipsa.
Page turn speed is comparable to a Forma. It feels slightly faster, but this might be my imagination because of the new shiny...
At least there are no performance problems driving the bigger screen.
This large screen without header/footer patch is just sad.
Didn't do much with the pen so far, scribbling notes in epubs works fine, and it is reasonably responsive. A slight delay that you might notice, but not bad enough that it is annoying.