I love this device, it's a fantastic video player, and a fantastic web browser (although you have to pay for additional licences for web browser and some codecs)... the WiFi works so much better than some other devices I've used.... the file manager is pretty usable... and the music player is nice enough. I would easily give it 5 stars, but there are some imperfections.
1, No standard USB connector (need proprietary cable)
2, No bluetooth (so you can't browse on the move unless there is a hotspot)
3, As yet, the available plugins are very limited
I would be say that it needs a calendar, an email client, a notepad,
an SSH and/or RDP/VNC client and a few others at the very least
(These may be available as software updates, however)
4, I have seen it hand/reboot a few times unexpectedly.
Overall, I'm very happy with it, but it could do so much more.