Yep the Flirc case is good looking but it stops there, it's not as efficient as one would expect from passive cooling.
I tried few fanless cases, Flirc included and I was not impressed, the top of the case is not aluminum but plastic, strange choice.
Geekworm does a better job, at least the one I've got, never goes over 55°C in hot summer, the rest of the year is around 39°C to 43°C not more.
The case is heavy and sturdy, it doesn't feels cheap at all. https://geekworm.com/collections/raspberry-pi/products/raspberry-pi-4-heavy-duty-aluminum-passive-cooling-metal-case