open email, facebook and browser simultaneously, BAM... hang
and somehow the browser will also make the phone hangs when visit certain (not ahem) websites.

battery life is quite good though. On 3G from 11am till now still left 18% after playing with the camera, updating apps, browsing and pulling emails every half hour.

and found out some flaws with the design. The speaker position is at the back of the phone, next to the camera. And the back of the phone is flat. If you put it on a table, incoming call sound will be reduced in approx 70%. Put the phone on a book, magazine or newspaper, cant hear any incoming call sound.

and no lights providing illumination for the four buttons below, hard to see during night time.

verdict: if you're a heavy user, dont buy this phone. Go get a HTC One S, Galaxy S II, etc is even better. This phone is more suitable for those casual users. Those who buy this phone, be prepare to "kill" tasks everytime finish browsing, especially after browsing FB (the app itself). The app itself is a headache. It eats up RAM and makes the whole phone lags and in worst case scenario, hangs.