The app, Move to iOS, was released alongside iOS 9 earlier this week, and is designed to help Android users transfer their data, including contacts, email accounts, and photos, to a new iPhone. Strategically, the app makes complete sense for Apple since smartphone growth in the US has largely plateaued, meaning smartphone makers like Apple and Samsung are fighting over the same potential customers.

Just don’t tell that to the folks on the Google Play app store.

“What do you think I am? Mad?” asked one reviewer named Harvey Drysdale. “Why on earth would I move from Android to Fisher Price? Sorry, I mean iOS. Sheer madness I tell you!”

“Do not install!” shouted another, Ben Bartlett. “Unless you want a lobotomy,” he then clarified.