One aspect I was expecting both pieces of software to fall over on, was WordArt. Write completely ignored the WordArt, as expected. OpenOffice Writer not only opened it, but displayed it almost identically to Microsoft's original.
As you can see, the rendering is very close. Microsoft's version was anti-aliased so looked a lot less jagged, but I think that's impressive!
As you can see, FontWorks inside OpenOffice is just as powerful as WordArt and completely compatible.
Aside from the WordArt problem however, Tesco's Write did a capable job of opening the Word file.