Below are some of my finding during the 2 weeks usage of the Vivaz:
1. The phone will perform quite smooth (without much lag) if you are using the phone default theme.
Once you start to download theme from the net and specially those big file size theme, everything will start
to lag. So, "beauty" theme slows thing down, "basic" theme faster in processing.
If you are using the default Standby Theme (the Sony Ericsson rather than the rest like Navigation bar, Full page
and etc...), it seem perform smoother.
2. Video performance. Wow, I must said, this phone is very good with a high quality movie.
I'm using Total Video Converter to convert those avi, mp4, mkv movie i downloaded from the net. Tested on the
"Iron Man" which is in 720p original file size (2GB++). Converted to 640x320 with a video bitrate of 1600kbps and
25 frame/second, using a container of "xvid".
The total converted mp4 file size is around 1GB++. The movie just play back smooth like silk and the sound also
correctly play back. (Some phone will play back, but the sound will 100% out of syn with this high video bitrate)
Tested with another short clip about 4 minutes with the same condition but this time, using the video bitrate of
3200kbps (as the movie original is already in high bitrate). Guess what? Still play back like silky smooth.
To me, this is just like watching blue-ray movie in a much smaller screen of LCD TV.

3. I don't like where the power button at. I'm someone that like to copy file between my PC and the MicroSD card and
I like to copy it via a memory card reader rather than using its USB cable simply because it copy faster. Whenever
I open the back cover, for sure I will accidentally press on the power button and turn on the phone. Ya, I know, I
can take out the memory card without power down the phone, but the point is, the power button still in a place
where it is very easy to accidentally press. Unless you always hold the phone in horizontal way.
The rest seem like working as it should be, happy with the phone so far.