How long has it been running? Have you figured out anything to use it for beyond what other assistants can do yet? I'm very curious as I had the same idea but don't have time to implement...
In terms of what other assistance can't do, it can integrate w/ my desktop computer in a way that other assistance can't easily do. The M$ voices take things to another level. Apple has better quality voices for Siri on desktop, but they don't let you access them through the 'say' command.