Only issue I have seen is that, whenever I ad a new item to a category, the total number of items (as shown in the summary module) in ALL categories increases by 1. So, I have a total of five items in the entire system. The system has 9 different categories. EACH category says it has 5 items. The total number of items ("All") says "45". Checked all the config options but don't see anything that can fix that.
Community Builder integration is there but is a bit buggy. With CB integration activated I would get bumped to the CB profile page whenever a new item was added. I turned it off and everything else worked fine.
A confirmation e-mail to the user would be great, as well as the ability to set a different administrator e-mail address than the web site's general administrator.
All in all, a great extension!
Regarding the number of ads by category, did you try the different type of SQL query (module option) to sort out this error.
Don't hesitate to contact me if the error is still there !