Tree Checker--I am all for anything that allows us to make corrections more easily. Possible Errors had only two tabs on mine: Possible Duplicates, and Other Possible Issues. You can further filter the list by clicking on More FiltersFamily Line
End of Line
Other Possible Issues
I noticed that once I corrected or merged I was given the option to View All Errors. This was not helpful. It had opened the selected issue up in a new tab(I'm on Chrome.) An option to close this window and refresh the previous screen would have been more helpful for the process.
Beyond the duplicates, the error that I noticed the most in my tree was caused when I'd added the 1940 census. Some of the children who were under 5 in 1940 had gotten a residence fact associated with their profile. I believe this was corrected at a certain point and it's no longer necessary to remember to uncheck that box when adding those under 5 from the census record. It would be nice if there was a way to work on specific errors other than have them all lumped in the "other possible issues" category.
It discovered a "floater" in my tree and displaced this error when I clicked on the "!"