Thank you for your interest in BRAT. Most BRAT users only interact with the output GIS layers. As such, pyBRAT is not a polished professional grade tool, with an easy-to-use GUI interface or Add-In to ArcGIS. Instead, PyBRAT is a compilation of scripts housed in an operational grade Arc Toolbox designed to make it easier for our own analysts to run the model . Nevertheless, we do provide pyBRAT download and step-by-step instructions to allow those with good geoprocessing skills to successfully run BRAT on their own.
Note that pyBRAT 3.x is now superseded by a Beta production grade sqlBRAT, and pending proposals are in to make it Commerical Grade.