What a change one day makes! First day I was having more problems than I wanted (several crashes, sluggishness, WLAN configuration problems etc.) I don't know if the device needs one day to warm up or am I unconsciously avoiding possible problem situations. Second day the device was smooth, web surfing was quick and no sudden reboots or crashes. Well, except one: Web browser refused to start (popup appeared "Opening page" and then disappeared, but browser didn't start), reboot fixed it.

I was first a bit worried about advertised three hour battery time. Yesterday I used the device for straight four hours (wlan wasn't always on) in various activities watching pictures from MMC, listening music, reading PDFs, surfing web etc. After four hours, when my wife informed me, that the device will be thrown out of the window in a couple of seconds, battery indicator had still two notches left. So 770's battery life is much longer than my wife's patience.