I was a supporter of Cooler Master's campaign on Kickstarter for the creation of this case for the RPi 4, from which I have purchased my own.
Overall, it is a good case, with a beautiful design, aesthetically pleasing, and good build quality, characteristic of most Cooler Master products.
The top part is made of a single piece of aluminum, which, through thermal pads, functions as a passive cooling mechanism, very effectively, even if you overclock (I only managed to push it so hard that it shut down due to temperature once, on purpose, to test its capabilities). The bottom part is made of plastic, while it has a protective rubber casing.
Additionally, it has an on/off button, which can be programmed with a simple script for various functions (e.g. for safe shutdown, for launching a specific application, etc.), depending on how many times and at what rate it is pressed.
In the packaging, which is made of recycled cardboard and also serves as an installation manual, four VESA wall mounts are included, with which it can be mounted behind a TV, a monitor, or on the wall (e.g. if you want to use your RPi as a Kodi TV box).
Due to its small size, as it barely surrounds the RPi, it also has excellent portability. Not that other good cases on the market, such as the Argon ONE or the Retroflag NESPi 4, are really bulky, but they certainly have a larger volume. Also, an advantage that this case has compared to some others is that it maintains access to the microSD card.
HOWEVER, and I repeat, HOWEVER, Cooler Master managed to confuse the GPIO pin layout, resulting in the connectors coming out of the case not matching those of the RPi internally and, of course, not being able to directly connect RPi HATs, with the risk of either the RPi, the HAT, or both getting damaged!!!
Cooler Master publicly admitted that they messed up in this specific issue and compensated those who requested it, including myself, of course, only for the case, not for other products that we may have purchased through that campaign.
Of course, there are diagrams circulating on the internet that show what corresponds to what, and therefore, if someone wants to, they can wire each pin of the case to the correct pin of the HAT, but I believe that somewhere there, all the logic of HATs, which are almost plug & play (usually with a script), is lost.
That is why I rate it with 3/5 stars, instead of 5/5, which I would definitely give if this issue did not exist.
So, if you are interested in using HATs with this case, think again! If you are not interested but just want a media center or a mini PC, it is an excellent choice!!!

Extremely high quality and beautiful case. Small and relatively lightweight. It functions as a cooler with very good results, allowing for overclocking. The top part is a solid aluminum block that touches the CPU, while the bottom part is semi-transparent black plastic. It has a rubber casing around it for protection.