Loved the stackable design but it's misleading to call it passive cooling or suitable for heavy loads, the case is mostly plastic and the heatsink got uncomfortably hot after running it for a few hours. Maybe it would work for light usage but not going to trust it with a $100+ SBC when most project calling for a Pi are for home automation or low power private clouds.

This is a great case. Small and keeps my pie extremely cool. Better than the other case I had with a noctua fan. I willl say clustering didn’t work as well as I had hoped but worked about as well as I thought since airflow is pretty restricted to the sandwiched fan. My pi was running about 15° (F) hotter when clustered. No big. Case is small enough that you can hide several together (un-clustered) easily. Great case.

A lot of thought went into the design for this one.Pros (assuming thermal paste):* Impressive thermal mass without fan for moderate or intermittent work loads* Fantastic cooling with the fan added even under sustained heavy load* To me, the fan is pretty quiet on 5V* Openings/access to all ports and LEDs* Designed to be self-stackable (including with fans)* Everything you need including extra thermal pads and screws are included* Pretty handsome, angular, clean black designCons:* Having to clean up thermal paste every time you need to open up your case.My take:If you won't often open your case, this is a great one! Super functional and well thought out. Definitely a fantastic value. Use a dot of thermal paste, IMHO.Long version:Thermals first. My first few days I kept it light and didn't have any heatsink. It'd get 75 C+ under sustained load easily. Idle was about 50 C in a cool room.I installed the case first without the fan. I used Noctua thermal paste instead of any sticky pads, anticipating reopening it. Booted to a cool 30 C. [This very slowly creeps to 45-50 C without the fan.]Stress tested, streaming 1080p while viewing remotely over NoMachine, lol. Constantly hovering around 88-94% CPU load, CPU clocked at 1.8 GHz.A word on running without the fan: The block is a large heat mass. Very slowly over 60-90 minutes, the temperature crept up and up eventually reaching 63 C and slowing down in temp. I don't know if it saturated or not, but it did climb.The heat translates through the whole block. Checked with thermal cam, and the top of the block was 62.3 C, matching the CPU sensor.I then added the fan while it was hot and running. (Yeah, probably don't do that.) Temp quickly started dropping, it's hovering around 35 C now, still under constant load.If thinking about this for thermals, I think the massive heat block will probably help absorb short loads. Under continuous load it gets toasty still without the fan, but then the fan helps a *lot.*Design wise, it looks nice and clean. All ports and slots are accessible. You'll need to attach any needed ribbon cables (camera, display) before closing it up.And there's the only rub: with the big heat sink being part of the top of the case, you have to worry about the thermal bond to the CPU every time you open it.I *strongly* discourage using double sticky thermal pads for this reason. Thermal paste isn't a big deal, but then you're still looking at cleaning and reapplying every time you open it.And now as I finish typing this I close my stress test and let it idle. Already dropped from 35 C to 30 C again (fan still on). Just bonkers.

Great product, comes with everything you need and includes spare heat-transfer pads and screws which is great! pi has dropped at 12deg and stays cool under load.

The included instructions are very clear, it has an extra of each of the smaller screws which is nice, there are three thermal pads in case you mess up or need to remount for any reason, and the included screwdriver is functional. I had no issues with assembly. I do, however, question their stacking method claims and feel like the airflow for fans would be highly impeded, but I was not able to test that since RasPi4’s are so expensive and I don’t have more than one spare right now. In the stack, the fans are smashed up against the case above, which doesn’t allow for flow. Especially since these little fans are not capable of good static pressure and require good free air space to achieve good flow through. But if one were to just use longer screws and longer stand-offs to allow adequate flow between the cases, it may be just fine in that configuration.With that said, I took a spare Pi4 I had with four individual standard heat sinks mounted on it and ran Stressberry on it. The results were about what I expected starting at ~47-48C @600mhz, ramping up to ~70C @1500mhz. I then changed out the heatsinks and mounted the Pi4 in the case with the included thermal pad and ran the test again with passive cooling only, this time it was starting at ~34C @600mhz (wow) and ramping up to only ~53C @1500mhz (wow again). I then added the included fan and ran the test once more, starting at ~30C @600mhz (geez) and ramping up to only ~38C @1500mhz (amazing!). I can say I’m thoroughly impressed by the cooling performance! Even passive only is quite good.I guess aside from the stacking configuration, the one complaint I have would be how hard it is to remove the translucent cover for the pin header. It’s quite hard to do and I feel like I’m going to break something in the process.Of course it is always nice to have features like temperature controlled cooling fans, but for the price I can’t really complain. Also for what it’s worth, the fan volume was measured at 40dBA from base ambient of 35.6dBA from about six inches away. Measured from a more proper three feet, no noticeable increase was measured over my very quiet PC fans. The fan sound is clearly noticeable as a different frequency though. But given that it is blowing into a confined area that’s to be expected. It also clocked ~8CFM on my meter, which is pretty standard for a fan of this size.In the end, I really like it overall. Since I likely won’t ever use the stacking function, I really don’t care that it’s not ideal. And the header pin cover is rather annoying, but oh well. It works very very well for the price!