I have received the new Magic Keyboard. I can’t speak for others but I think it is awesome! I love the typing experience and the ability to keep my hands on the keyboard and not have to reach up. I think this is going to be a game changer. I wrote in a previous post why using the iPad exclusively would be of value.
Since that post I have been using the iPad for 80%+ of my work. With this new magic keyboard with the trackpad I should be able to use the iPad for 99%. For my work needs the only sticking point I see is when I need to do multiple file manipulation. It will take me a couple of days to retrain my muscle memory but this should be a great experience overall. For 99% of my work I will have one device, one OS, one GUI to use. While there will be points of friction, for my use case, they will be minimal compared to the overall productivity, modular capabilities, mobility, long battery life, and ease of use.