I used to have one of those. Think it was 600W on highest setting. Only problem with it was it was tiny and barely anything fit in it. Pretty sure it was meant for RVs but it was $10 at a garage sale and I needed a microwave at the time.

Can confirm, lol. For breakfast, I heated up some leftover spaghetti and meatballs I made last night, and 5 minutes at 60% was the perfect amount.

I think the general reason for that is more about the turntable. There are always going to be hot and cold spots in a microwave just based on how they work, they can't eliminate them. So spinning the food around means that sometimes it is in a hot spot and sometimes in a cold spot... Except the very center where it is basically just rotating in place. It is either going to be a hot or a cold spot more than likely, and whatever food is stuck there is going to burn or never cook.

Popcorn in a pan is so much better, really easy, and SO much cheaper than bagged microwave popcorn. I bought a flat-bottom wok specifically for cooking popcorn because I like it that way so much, but I made it for years in just a normal pasta pot.