I'm running some headless Pi servers and wanted something cheap. It meets and exceeds my requirements. They can be used individually (flat or with an extension that can hold a hat). Or they can be stacked on top of each other and come with a detachable, sliding mounting base that can be attached to a surface with screws. Besides, I didn't need it. As in many cases, the GPIO pins are exposed. But if you're using a hat, there's still room in the case, so everything is included in the case. It ends up looking semi-professional, not like a Frankenstein with wires and circuit boards hanging down The build quality is excellent (no excess plastic from injection moulding), all the parts fit together well. For $10, it dwarfs every other case I've seen. This will be my goto case. Highly recommended. The photo shows 2 units, the bottom is a pi with no hat and the top has a hat with a deeper cap. The only thing I would suggest the manufacturer is to make an extender/connector (for the middle units in the stack) , which allows the hats to be used on medium blocks.
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