More on the combo: don't expect any one with the oven feature to cook anything but crescent rolls. Baked potatoes are out of the question unless you have all day. Well, I have what they call a toaster oven and it's slow to do anything including toast. I didn't spend the money.
There is something called a Ninja 14 in 1. First thing I saw was Jeff's idea that steam was good. It has steam. Having a good oven/microwave combo means you can have baked potatoes in 9 minutes and they are very good. I've braised vegetables in one and the broiler function is quite good.
I have a GE Speed Cook oven that cost over 2K new that I bought scratched on the face (it's built in) so I got it very cheap. It's been a mainstay in the kitchen because the main oven is an old Wolf commercial range with 4 burners and a griddle that I have used once. It takes 30 minutes to heat the griddle or oven to the correct temp. Not a good choice for the home kitchen but it looks cool.
Mine doesn't have the salamander which I would use.
So this isn't mine. (Mine is cleaner as you would hope) The griddle is level with the 4 burners. I'd almost pull it out and convert but I put a cutting board on it. Very handy. The oven will do two 20 lb turkeys side by side. Too much.
So, a really good counter top micro/combo can be a real trick item in the kitchen f you want to spend over $400. I would if I didn't have the Speed Cook.
It uses halogen lamps and a LOT of electricity!