There is no “import/export” process, you just open it and it works. It fails sometimes for docx, but only for the fancy page layouts (like if you want a full page background image for your company official documents ; or if an ass overloads tables in the file). Even if it fails the document shows up with all the text, it is just the layout that will be different.
Compatibilty, stability, pdf export and import is all very good. Calc has no real differences with Excel for my use cases (less automated formatting options) Impress is a little lagging behind powerpoint in terms of compatibility and formatting option (this may nag you if you have to use templates from other people). Otherwise I have no issues working with LO on Linux in full Windows Office 365 coworkers
Hurray for Lovecraft ! Cthulhu F’taghn ! :-D
Deezer, french service