If you are concerned about harmful attributes of this app towards your device, then it is quite clear that it doesn’t go against any of the apple security policies. The reliability, stability, and security provided are at the optimum level. Users are often concerned about the warranty void. As this app doesn't need jailbreaking, so there is not any chance of the warranty getting void. It recommended removing the tweak feature when you are sending your device for any repair work. Opt to remove the tweak and after repairing install that.