Well, It's free but it's also essential to use shopify for digital products. They need to do so much work on this app though. We need to be able to see when a customer has downloaded and from which IP address with order details. I can delete files for the digital products that have been removed.
The stat's page needs a complete redesign. Need a global setting for download limit. The list goes on.
It does do the job, but needs some love to make it great!