Here is a more honest article (in Finnish) from someone who have used the device for a day: http://mobiili.fi/2013/11/28/jolla-vuorokauden-kaytossa-tass...

English translation: http://translate.google.com/translate?sl=fi&tl=en&js=n&prev=...

According to the article the biggest problem seems to be Internet-connectivity, the reception is sometimes bad and it has problems connecting to WLAN. The browser is also quite slow and needs improvements.