I am a lawyer myself and even if I only do basic text editing, openoffice cannot be used professionally if any document has to be shared with others in word format - the main gripe for me are not page headers, but loss of all dynamic references to sections when saving as DOC file.
("as defined in Section 17 below" becomes "as defined in Section Undefined Reference"). This is a loss of critical information in a contract and mistakes here could cause professional liability. Oh and kids - none of your clients will install a new office suite, if you ask them to, either they can't for security reasons or they are not willing to spend the time. You would lose every client by requesting them to install new software just to read our ODF documents.
I have notified this bug before OpenOffice 1.0 was published, there has been some progress, but instead of fixing basic functionality completely that would allow seriously considering just replacing Microsoft Office with OpenOffice, we get GL based effects in OpenOffice Impress, Antialiasing and other things not really essential for getting serious work done by lawyers. A bit disappointing...
I am not using linux only for my private stuff - virtualisation is not the answer, it's much easier to just use Windows or maybe MacOsX directly on the hardware instead of on top of linux, which would then only add a layer of complexity without any gains.