I have this on my back deck and for my escapee Oliver it has been the best thing ever.  Oliver use to jump off the deck and we would have it worried us too much so we bought this and he loves it.  Oliver goes to the slider when he wants out and let's me pick him up and purrs so loud.  I hung a dark towel at one end of it yesterday and he stayed out there content for at least 10 hours between coming in for potty and meals.  I recommend this for anyone wanting to let their indoor cats enjoy the outside.