Adelsklang QR-49 PRO Black & White

Ordered two of these, they came well packaged but without any installation screws. Nice black and white look, but the black is more "wood painted black once" showing some grain on closer look, and the veneer is quite thin, so I would rate quality on closed inspection 8/10. Mounting holes are asymmetrical which caused me to drill holes in wrong places -- thankfully I was able to drill additional installation holes to compensate. Surprisingly heavy and deep. I believe they work well, using two behind my monitor and 8 absorber panels in the room walls + 3 on ceiling, the acoustics improved remarkably well.

Installing two side by side to a concrete wall where holes easily "veer" several millimeters makes aligned and straight install pretty challenging, not a problem of the product per se, but something to note in case you install them where you look at them 8 hours a day.