They are a great way to spot the action Roy. I have a purpose built hide down by our lake and use to spend many an hour in it chilling out and watching all the activity. Unfortunately don't seem to have much time nowadays.
But how do you get to the tent from the back door without scaring the birds? This is a fantastic back yard solution. Can even have coffee or tea, music on your digital player, snacks, books, wireless internet, the list goes on. Your wife may even suggest a cot and you could live out there! :)