I have been using DocMan Document manager for a few years and decided to upgrade to the latest version. In doing so, I had to install ExtMan for the latest version of DocMan to work with Joomla. I had a little trouble with the install and posted a trouble ticket. I received a quick response from Johan. He was able to easily identify my issue and and made all the corrections for me. Probably the best support of any Joomla extension I have purchased!
I highly recommend JoomlaTools!