DAC board and case exactly as described. Fits the raspberry pi 4b perfectly.
Based on the first tests, the actual sound quality seems impressively good, a major upgrade on the built-in sound card. Installation is easy with any Linux distribution shipping with the raspi kernel patches, for example recent Ubuntus. (On pure Debian, you'll need to recompile the kernel since it does not include the DAC board modules by default.) Overall very highly recommended.
Fast delivery to Spain (9 days). Works well after easy to follow 2 steps "installation" which you can find in product description. I chose it because of the two clocks crystal design! At first sight it sounds good.