I have the same Panasonic combo microwave as the one linked. It is great although, as nanthewiser says, quite a lot bigger than a traditional turntable one, which is what I had previously.
I used the previous microwave oven (turntable one) to cook all our food for a family of four because we were without an oven for two and a half years!
I cooked most things in it, the only limitation was in terms of how much I could cook at once I.e. Only one thing at a time with the turntable microwave and using dishes that were small enough to allow the turntable to rotate. With the new one, it is possible to cook using two levels and with larger rectangular dishes but not as good as using an oven (which I now have. Yay!).
I even baked dd's birthday cake in the new microwave a few weeks ago and it came out fine.
I have successfully done roasted vegetables, potatoes, chicken pieces (not a whole chicken), casseroles, pizza, oven chips. The one thing that didn't seem to work well in it was a crumble which just burnt on top because it was too close to the heating element.
So, all in all, even though I now have a shiny new and working oven , I still use the combo microwave a lot because it heats up so fast and cooks quickly.