Yes, I am happy.
Keep in mind, it is not tablet. It is aimed mainly for reading documents. It is possible to use web browser, but it is rudimentary. e-books are not very suitable for web browsing.
Not everything is perfect (the user interface might be more user friendly to speed up workflow), but I am not aware about better solution on 10" e-paper.
There are probably better solutions (I mean programs for reading, anotating and handling pdfs) on tablets, but I work too much with LCD display and need e-paper solution....