I've just tried to add the Jurassic Park Ultimate Collection by inserting the discs into my pc and letting Profiler read the Disc ID.
However I found that unlike when duplicate UPCs are found, it asks you which locality your copy is from, Add Inserted Disc defaults to the first profile found and does not let you choose from any others that may also match.
This seems to make the "Add Disc" option pretty much useless, as all the profiles chosen by Profiler were the wrong ones, so I had to add by Title instead and manually compare Disc IDs.
Has anyone else noticed this problem when using this method?