It's faster (C++ vs Java) and more compatible with the documents I have to open.
It also pleasantly surprised me once:
I received a Powerpoint presentation, and went to a customer meeting, where said presentation had to be presented.
I plugged the HDMI to VGA adapter for the VideoBeam to the laptop, started the presentation, and the presentation was running in the external display, while the laptop display was still showing the normal 'Powerpoint' view. I could load the web browser in the laptop display to check some things while the presentation was still running undisturbed and the speaker and the audience was happily unaware of it.
That level of professional use in software was something I did not come to expect in Ubuntu for any third party software. In fact I don't know if the other Office suites (including MS) have that feature. I guess they do, but still.
It is wonderful when everything just works as intended.
