According to the specs the thing has a resolution of around 118 dpi (1024*600 @ 10.1"). A bit low for comfortable reading imo.

My ereader has 160 dpi and that's barely enough for comfortable reading.
Then again it's not marketed as a ereader.
Hopefully the Mirasol devices will have about double. I've read somewhere that the proof of concept thingy had 220 dpi.