Here at the City of Ottawa we make use of AA extensively. We use it mainly for roads, addresses, sewer and water data editing. It is also in use for other departments for items such as created_by, created_date, modified_by, modified_date and the creation of unique IDs.
We work in Oracle and SDE and have found that this sometimes introduces issues. We have two outstanding NIMS ( NIM100667 and NIM100535 ) that are related to the creation of duplicate IDs when using the Generate_ID method in Oracle. It would be great to see these fixed as we have had to implement custom code to work around them. You will see the custom method in the attached file - GENERATE_STRUCT_ID.
One big complaint we get from the users is the look of the icon that AA uses. They find it difficult to tell if it is on or off. As part of their workflow they sometimes have to turn AA off, so that it does not fire in specific situations. In the past they used the prompting of the location of the log file as an indicator that they had AA running. I am told that this prompt is now gone in 10.3, so that is no longer an option. I had posted a geonet question to see if the icon could be changed, but did not get any response (Can we change the Attribute assistant icons?
I would say that one of the things we use extensively is the COPY_LINKED_RECORD method as we have a legacy system that is used to maintain our road names and addresses. This method allows our users to find the information from that Oracle based system and populate the information in Esri.
We have created a few custom methods. One is mentioned above. The second is called GENERATE_SERVICE_POINTS for the creation of small services for our Water utility group. The third is called MOVE_BY_DRAG_AND_DROP.
One other minor item I find frustrating it trying to find the help for AA. If I follow the link that Michael supplied at the top of the page, I get to the overview of AA, but from there I can't get to the documentation that describes how to use the Value methods. I always have to go back and google to find it.
Thanks,
Alison