[greazy]

I can fill in my opinion of Impress <-> Powerpoint.

It's atrocious primarily due to MS not following open ODF. Everything is out of wack, dot point have different shapes, and spacing is wrong.

Impress is also not all that great. It's defaults are generally ugly, its auto sizing breaks and the animation pane is buggy.

Calc is much better. Writer is decent compatibility with MS