BUT Support is dire, you will wait weeks if ever to get any help from a member of the team AND you will have to pay to even ask a question. I am sure the reason why ZOO is so good is because their developers spend all their time on the product and not the forum, thats fine- the product is great- BUT you have to pay to access the forum, where you will almost never get any official support. And because it is a paid for forum, you will most likely be the only person on it, so you wont get much help from the community either because nobody wants to pay to access a support forum that offers no support.
Its great for adding attachments and offers users another way of adding content if they are scared about editing pages since they can simply attach word docs etc aswell.
It is dead easy to use and very user friendly from the front end which is in my opinion vital.
Just one word of warning: I almost gave up on this attachment after installing it on a local testing server as I received a number of errors relating to imageresize.php in the front end. I think these relate to not having imagemagik installed on my local server. When I installed it on 1and1 on a live site however everything worked fine and I discovered the 'edit' and 'delete' functionality in the front end which, because the images didn't show up on my local testing server, I did not realise were there.
So perhaps imageresize is not necessary for the icons and this might enhance compatibility across more servers.
For me that just isn't on as I do not want Joomla updates to screw up any modules that I will have carefully created. Its just one more potential problem that I don't need.