I've got a double oven, and the top one has a grill in it. The grill works fine, but the top oven is a bit hit and miss; mainly because it's not fan assisted so seems much slower.
We also have a combo microwave with a grill and convection oven that we bought as a stopgap when our old oven stopped working and I still run out of oven space when doing a big roast dinner
My sister has an oven with the grill in the top and it's a complete PITA ime.
Mine is a Hotpoint BDsomethingorother and I can fully recommend it's "self cleaning" properties...as I haven't had to clean it in a year
not sure why I'm still up as I've been up since 4.30am thanks to bumble...three days in a row now; am on my knees!