This is indeed a wonderful gadget. A few of us, however, are fixing the Ontario, Canada, location categories. A while back some categories were changed to reflect legal entities rather than the location names that Ontarians and Wikipedia actually use. For example, Municipality of X (Original), Town of X (Modern), City of X, etc. These are in the process of being changed back to X, Ontario. In the meantime, we'd like to ask WikiTreers to refrain from categorizing their Ontario ancestors until this process is complete, hopefully in a month or two. Thank you!