Well, I got one (the Sage). It had gone up by £50, which is annoying, but I had nowhere to put it until now. I have tried it tonight, and the functions I used seem fine. Whether it will do what I wanted and replace the Ninja remains to be seen though. I suspect not, to be honest.
I also think it would have been better if they had included a recipe book. For the price of the thing it's not a big ask. The instructions assume you know why (and when) you'd want to use the myriad functions. As I had a Sage microwave before, I am familiar with a lot of them, but by no means all. This machine seems to be capable of doing a lot!