I have been playing with this device for about a month now and find it very reliable and works well on any wireless.
I would have to say the book store is a little if not a lot more expensive then either Amazon or Barns and Nobel. But you do have the option of loading pdf files to the device and reading them on the e-ink side.
There is another issue I did find with the device is that like most mobile platforms is does not have flash which make watching You Tube impossible.
The reader is a little slow to turn pages as noticed by some of the people at work. And the note book take a little to get use to.
One great note her is that the company is always upgrading the device and updating the software via a FREE update service.
Over all you get a lot more from this device then you would the Kindle or the Nook. And the cost is in alignment with the other devices.
Please check back and as I learn even more about this device I will pass them a long to you.