Qnap, excellent.
Expansion card used as a cache in a Qnap TS-873 NAS where it fulfils its role perfectly.
A quality product, powerful and very well finished.
To quibble, I only encountered one difficulty: I'm probably not used to fixing M2 SSDs with a screw that is integral with its holder. Usually (well, for the models I've had so far), there is a small cylinder with a "male" thread (which goes on the card) and a "female" one (which receives the screw). First you attach the cylinder to the card, then you put the M2 SSD and finally the screw. This is different; the screw is integral with the cylinder (it forms a single unit), which means that the fastening system must be mounted at the same time as the M2 SSD on the card. Nothing complicated, it's just that I wasted time trying to unscrew a part that can't be unscrewed since it's made of one piece (cylinder and screw).
In short, I recommend this product without condition.
