I recently started using cast iron and I wouldn't go back to anything else. They are a little more high maintenance. But I think they cook a lot better.
This is the best way I have found to clean them Pour a small layer of equal parts water and white vinegar on the bottom of the pan. Heat the diluted vinegar on the stovetop and allow it to come to a boil. After it boils for a minute, remove it from the heat and drain the vinegar down the sink.
We have a few meal kits at our local grocery store. I have tried a couple of them and I didn't think they were that great. They weren't bad, but I would rather make something on my own.