Control Center wont (easily) open
The design of the disappearing header appears to affect the ability to open Control Center from the bottom of the screen--at least for me it does, YMMV.
The app and Dictionarys definitions are very good; I especially like the thesaurus and hyper linking of words. And while I I prefer using the New Oxford English dictionaries, simply browsing the App Store reveals dozens of high cost apps with minor differences. The investment is simply too high to justify abandoning the app if I dont like it, so this is a perfectly suitable alternative.
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Dictionary.com Pro English, v7.1.1