I got this app for my toddler son. He loves it, and I like it most of the time It is simple, has a decent sound (better than most, if not all, of the piano and xylophone kids apps I've come across), and I love that the keys are big enough that they are easy to touch the key you want, not the one next to it. My only complaint it the ads. My son hits the ads often and then yells at the iPad because he gets frustrated that the xylophone went away. I would very, very happily pay a dollar or two for this app to not have the app, but there is no Pro version. It is a big enough issue for me that I very often dread my son asking if he can play it, and sometimes hide the app and encourage him towards other ones.