Using with 2018 Mac mini currently (running macOS 11.2.3 - Big Sur). WD 1TB SN550 NVMe drive installed Did speed tests, then transferred over 300 GB of data from different drives with no issues, no random disconnects/power off. Sequential Read 900-950 or so MB/s with multiple speed testing apps - this is lower than the performance of the NVMe drive installed - which should be capable of 1,700 MB/s at least (advertised up to 2,400) Sequential Write 820-880 MB/s over multiple tests on 5 GB or smaller files - on larger transfers the speed drops to about 500 MB/s - doing some looking, this is a limit of the WD NVMe drive - it has a 7-8 GB cache, so that explains the drop in write performance on larger files. According to Disk Mark - the random read (65 MB/s) and Random Write (30 MB/s) results are lower than they probably should be for an NVMe drive (should be in the 100-200 range) - but it won't impact my usage, so I'm not looking into it. I'm using it for large video files mostly, so its performance is good for what I need, a big jump up from using a traditional HDD.

I like the chassis. Mine wasn't loose at all, fit together nicely. Matches space grey macbooks.

On an M1 air with a brand new NVME Samsung 1TB blue drive (SN550) I only got 560MB/s read/write. I believe this is the enclosure throttling the drive + connection, the other reviewer explains why... I tried installing some steam games and league of legends on the drive. The drive randomly disconnected during any install, and I even tried doing it over again - consistently it would fail a few minutes into a large transfer. It doesn't get particularly hot, just a little warm, and I'm certain the heatsink + thermal pad is on properly.

I'm returning it. I bet for small file transfers it would be OK, but I wouldn't trust it.

Top Speed?

Reliability firmware updates to drive impossible not possible to read temperature Max 4.5 watt drive

This has the newest "B" version of the very problematic controller. It is much more reliable than previous versions but you can still find that your drive has disconnected from time to time. Be aware, USB 3.2 Gen 2 and all previous versions of USB 3 can only provide a maximum of 900 milliamps at 5 volts for 4.5 watts of peak power to the drive. You'll find even the lowly WD Blue SN550 has a peak draw of that much, and you have to leave some overhead for the NVME controller/USB bridge. Maybe that might explain the disconnects: it can't be powered fully during peak load. Forget about using a high performance drive. A WD Black SN750 can draw up to 8.5 watts, well beyond what USB 3.2 can provide. This is not the enclosure's fault, it's a limitation of USB3. I have some Vantec SATA SSD enclosures which have full trim passthrough and allow the host system to read temperatures from the drive and update the drive's firmware. However, this NVME enclosure DOES NOT allow the WD Dashboard to read the temperature, wear/life, or update the firmware of the drive. Don't bother with this. The NVME theoretical peak of about 1000MB/sec is nice but the iops are basically the same as a SATA SSD over USB 3.2 Gen 2 which is really what counts. A good Sata SSD enclosure offers stability, temperature readings, life/wear readings, firmware updates, and won't disconnect randomly. When it comes to storage, reliability is king. Don't bother with this. If you need a high performance NVME drive, put it internally. Buy a PCIE expansion card if necessary.