You're group works on one large canvas, so understand that everyone doesn't walk out with their own piece of art. Also, it seems obvious, but it takes time to dry when done. Ours wasn't totally dry for several hours after, so make sure you plan on heading home afterward. Even with those caveats, this was by far the highlight of my family's visit to NYC. A real street artist guides you along with just enough help to make the end result look awesome. You'll end up with about a 5x4 foot canvas that can be rolled up when dry. Really unique fun experience.