I bought this app so that my 9-year-old daughter and I could look out her bedroom window at night and name the stars we see until she falls asleep. She really loves being able to highlight stars and click to see a telescope pic of the star/cluster. It sometimes is a bit slow to react to movements of the iphone, but in general it has been great to see the stars mapped out in front of us. We also find it a bit challenging to get more information about each constellation as we see it. I think this app is geared more for adults. All in all, it is a good app. I`m just not sure it`s worth 1,200yen.