I installed and tried it this morning. It has lots of promise, but my two gripes were:
• Comments, etc. are stored on codestream servers. What if they go bust? Why not inside a git file?
• Issues can be created in code and created in git issues at the same time, but editing the issue afterwards doesn't sync up with the one in git. I think these are mostly living on their servers
If this utility worked directly with git, I would pay for it. Being able to edit git issues and have them highlighted on lines in Visual Studio would be awesome, and building documentation in a file on github by typing in code comments would also be great.