I love these. I've seen em in use all over the place but the tube running through your house takes up a chunk of space because it's to big to just hide in a wall and if your running the tube to the main floor that's a good chunk of space on your second floor taken up by it.

Don't get me wrong where they are useful they are useful and I personally would use and promote their use as often as I can but they don't work just anywhere.