Poll: Do you actually use the product you are working on?

Many of us are working on their own projects, side projects or for some companies. And we all know that the best way is to develop/work on a product that we also need/use (eat your own dog food).

Do you need/use it (other than for testing purposes) or are you just developing a product for the sake of doing something?

Feel free to comment what's the product :)