I guess this will be a rhetorical question unless a Beta user is able to confirm one way or the other, but I have manually edited the metadata in most of my library in order to have it conform to my own hierarchy of genres, using the "grouping" field to then fine tune some broader genre definitions. I personally don't like relying on the metadata choices made with a lot of content so I always set this myself. I wonder what the implications of this would be for iTunes match? Firstly, would it pose any problems for identifying the tracks to begin with, and secondly, assuming a successful match, would my custom metadata changes be honoured by the match service or would I be forced to download tracks with all the default metadata stored on iTunes' servers? This would be a pretty big deal for the way I use iTunes, and breaking my custom tagging would really reduce the appeal of the service for the way I tend to access my music collection.
