Functional Requirements for Bibliographic Records

I was reading in American Libraries tonight about the Functional Requirements for Bibliographic Records aka FRBR. Essentially, it takes MARC Records one step further. How frustrating is it when patrons want a copy of a book but do not care which edition? You end up either gambling on which one will be available first, or putting multiples reservers on. FRBR addresses this by allowing you to place a hold at the Manifestation (rather than Expression) level. Hopefully, the implementation issues will be resolved soon since there is already one vendor using it.