Open Office against something like MS Office is almost the same as comparing MCE2005 against the other multitude of media software out there. 9 times outta 10 the MS is going to win because it just feels that more finished off and that more professional.
Don't get me wrong, if you're broke and need an office suite that you can't go wrong with Open Office, but if you're used to MS Office then I seriously doubt you'll switch, it just doesn't compare.