I've had one of these for a while now.
I use it in the tractor when busy at certain times of the year.
SWMBO puts leftover wet type food (curries, spaghetti bog etc etc) into the single serve aluminium takeaway containers and freezes them.
A curry or similar takes about 45 minutes from turning the oven on to being ready to eat.
I put the food into a cold oven and turn it on, don't bother preheating it.
Sausage rolls, pies etc...... About 35 minutes from start to finish.
For 18 bucks ya can't go wrong.