The plugin works exactly as advertised. I run an anarchy server, so I’m only using it to search and get rid of illegal produced items, but the other features are definitely useful for more traditional Minecraft servers.
I think it definitely needs some sort of feature to detect items gained in a short amount of time by all players, because, while having a hard limit on items is certainly good in some cases, in my case where players can amass large amounts of items without duping, it makes me hesitant to set limits in case items are caught legitimately.