It is my first e-book reader. I was hesitant to buy it, because most e-book readers are 6" and don't have a good pdf support for scientific papers.
But I just realise that it can handle html and epub greatly, so I can read the papers even better than the pdf format.
The size of 7.8" with 300 dpi is just the biggest and the lightest in the market so far. The OS is very easy to handle and the are extensions like KOReader and Coolreader to add more functions to this e-book reader
Very happy with this device!