I've used it on a magazine job where I need comments from the Editor, Sub Editor, Sub Editors Tea maker, the cleaner etc. It is good does pretty much what it says on the blurb. I'd recommend it if you want to be sure how your stuff get's viewed, so they arn't trying to open jpegs in Paint or something. However getting clients to get the head round it can be difficult 'can't you just email it to everyone?' tends to be the answer.