Mate i make them for a living, it covers most of the vital food groups in one Pie,Hope you lot know all these pies and stuff you are heating in the oven is about as bad as bad food can be . But I do have the occasional one myself
take our, two bean Mexican pie for example
Meat, protein Tick
Vegetables, tick, tick tick tick (onion/parsley/ black beans/ white beans)
Grains, tick (flour technically)
no need to worry about all that other stuff like, 30% fat in the pastry or 40% fat in the meat and the high salt content when you have all that goodness of vegetables to offset it.
back on topic, i have one of those Jaycar ones and it does take a while to warm things up, but for the $$$$ and the convenience, i like it