It's a neat Sandboxie replacement once you start playing with mounts and startup scripts.

So did they also fix the rather annoying issue that if you shutdown the OS in sandbox it displays a 'The connection to the sandbox was lost.' dialog instead of quitting the process? We use it to run automated tests, for which it is actually pretty great with the .wsb files makeing it easy to get data into it and run script, but it's a bit silly one needs to workaround detection of whether the thing exited by using files for signalling the script is done with a timeout then killing all involved processes.