We have two combination microwave grill ovens. One is a Sharp professional model, built out of girders, stainless steel girders. The other a Belling domestic model. The grill element gets used in both, a lot. The Sharp has a programme to cook up to four full English brekkies at a time that makes good use if the grill, also roast potatoes and roast chicken.
If all you do with a microwave is heat TV dinners then no use at all. If you like your meat browner and potatoes with crispy bits then essential.