It will allow you to tag and catalog your items, but be aware that your pdfs will exist within Benubird's database. It's trivial to get them out again, but this can be off putting to some people. There are other apps that will tag them by keyword in place- Tag Everything is the one I used, but there are several others. It really depends on your approach to items- do you just want to be able to find them in the OS and get a different view of them? Or do you want to separate your document management from the OS completely?