I use Office365 (since the licence allows me to install on all machines in the family, it is rather better value than if it were on a single machine).
Having said that, I've put Libreoffice on a few machines in the family, tweaked the settings to make it more Microsoftish, (largely the saved file formats) and there have been no reported problems.
As Z says, there are some potential reported issues with more arcane use (particularly "Excel" I understand) but it should cope with even semi-professional use for 99.9% of users. (I made that number up!)
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