I have the smallest Blackstone they make and wish I'd gone slightly bigger, but I got mine for portability and storability so I guess I got what I wanted. Mine is small enough to run on a small green 1lb propane tank (its intended fuel source) but it functions much better when you use an adapter to connect it to a 20lb tank. Anyway, my primary use is for smash burgers. I can do four at a time and it's fine. These are made from cast iron and they're relatively thin so the heat isn't very even. But they're inexpensive and fun, so go bananas. One of my friends got one and did his weekly bulk meal prep on it. Cooked a bunch of peppers, onions, and chicken and whatever... minimal cleanup, a smart idea. It can also be a good breakfast thing, but the unevenness of the heat is something to consider with delicate items like eggs or heavy items with a lot of moisture like hash browns (which will brown unevenly if you just let them sit there).
TLDR: Smash some burgers, make some breakfast, do some brick wrapped chicken, and sear anything outside that you wouldn't want to sear inside.
