Mine is a Sage Combi 3 in 1. It is larger than models without so many features. I bought it because of the air fry function, as I'd hoped to get rid of the enormous Ninja Foodi. In the end, I've kept (and use) both.
The Air Fryer in the microwave works well, but doesn't hold quite enough for my needs, which is why I've kept the Ninja. It's a dinner plate sized tray, about an inch deep. It's excellent for roasting vegetables and fast re-heating things that you want to keep crisp and would go soggy in a microwave, but there are no shelves to put more than one thing in at once, and there is nothing like the capacity of an Air Fry basket.
The oven feature is great, and means you don't need to heat the gas oven (which is also good in summer when you want hot food but not a hot kitchen).
The microwave has lots of features, such as softening butter or melting chocolate, and a 'Smartcook' list of items that have built-in settings. There is a 'bit longer' button which remembers the settings but gives them multiples of 30 seconds more if they food isn't cooked enough. It feels complicated at first, but you get used to it, and if people don't want to learn all the different options it's easy to operate as usual by just selecting a power level and set the time yourself.
The grill works, but doesn't have enough power - it's faster to heat up the one in the small oven whilst the dish is cooking in the combi thing.
The only thing I don't like about it is that to use the oven, grill or Air Fry options you have to use a tripod with the crisp plate on it, which means you have to keep putting it in and taking it out, depending on what you're doing.
Overall, it replicates functions that I have available elsewhere, but does some of them more efficiently in various ways. I recommend it, but I am a lover of gadgets, and enjoy learning new ways to do things.