Installation - Easy to install and configure. I was up and running in a matter of minutes. Though I only had one pdf document, I was excited to see how powerful Documents Seller. I can see that it will fit our needs as we grow and add more documents.
Support - I posted several questions on the forum that got answered within minutes. I felt like I was talking to them in realtime. When I couldn't figure out a problem I was having, I contacted the support team on Skype. I provided him with backend access to help troubleshoot a problem I had for hours. He figured out the problem within 10 minutes. Tuan is the man!! He is not only technically sharp, but patient and respectful. This made it worth every penny. You can't find better support for a product than these guys. I highly and enthusiastically recommend them!
As my team's Joomla guru, I feel like Tuan and his support team have my back, so I'm never at a loss. Great product, tremendous, helpful, fast, courteous support. No regrets here!