How well does the mac and linux versions work?

They don't. I would not be surprised if you had to maintain a separate installer for each operating system you wish to support.

Someone on StackOverflow has a similar question: http://stackoverflow.com/questions/3904449/installation-for-mac-and-linux-on-a-windows-machine

The answer to that question points to this page which suggests you may have to shell out some cash to get the features you want: http://en.wikipedia.org/wiki/List_of_installation_software

Best of luck.

There is an auto-update feature in the 'One Click' deploy tool with in Visual Studio. During setup you give the URI where you will be deploying to. Each time your program turns on it checks there and grabs a new copy if needed. It worked well for what I used it for but I have never shipped anything using it. It has served me well to keep test machines easily updated with new code but I have never used it in the real world.

Oh yea and it is included in the Express version of Visual Studio so it is free.