This was a fantastic find. Combined with a WD SSD drive, this thing is LIGHTNING fast compared to any traditional hard disc drive, there's simply no comparison. Highly recommended.

Looks like great quality product. Came with all required to mount your M.2 NVMe SSD stick. Fan can be a bit noisy but there is a little button that actually turns it off. In actuality the unit rarely gets very warm. I monitor it and if I see it is a bit warm (and I mean a BIT) all just hit the button for and let the fan run for a while. Not the best scenario. If the unit is positioned out of the way of your work area you might not really hear the fan at all. A bit pricy but inline with similar devices available.

The casing get's really hot, which is apparently normal for these kind of cases. hopefully the case and the drive will withstand the heat long term.

Purchased this to house a Samsung 990 PRO 2TB SSD attached to a Mac mini m4. Easy to set up and it works great. Connected to a TB4 port in the back of the Mac mini (using the cable that came with the enclosure), I find the read/write speed to be very fast. This allows me to run Lightroom and photoshop, as well as other large apps on the external drive and keep the small internal drive of a base Mac mini freed up. LR and PS open very quickly and run smoothly. I attached one of the heat strips (thicker one) that came with the enclosure to the SSD and I run the fan on the enclosure. The fan is very quiet. The enclosure sits on my desk, behind a monitor and I don't notice it running. Without the fan, the enclosure did get a bit warm (I wouldn't say hot). With the fan, it stays pretty cool and the SSD temperature seems to drop 10C with the fan running. I am very pleased with my purchase.

This enclosure seems reliable, fast, easy to use, and is recommended (though a major caveat is I’m a first-time user of SSD enclosures and in the first month of use.)
FEATURESThe enclosure is aluminum and seems solid. The no-tool installation was super fast and easy. ACASIS includes plastic spacers so SSD sizes shorter than 2280 are supported, plus there are couple thickness of thermal stickers ready to apply that help dissipate heat between drive and enclosure. The installation could not have been easier, plus it’s easy to pop open if needed. The kit also comes with a USB4 compatible wire that’s less than 12” long. That’s short but I’ve read this length is best for highest transfer speeds in USB4 so doesn’t seem a shortcoming of ACASIS.BASIC SETUP
So far it’s been fast and reliable. My setup is 3-partitions on a 4TB drive connected to Thunderbolt/USB4 MacBook for Time Machine backups in one partition, SuperDuper! app weekly backups in another partition, and manual archive in a third.
SPEEDY
All seems fast, reliable, and compatible with USB flavors from 2.0-4. My SSD supports 3500MB/s transfer with actual rates in practice at around 2750. This is apparently expected performance via Thunderbolt/USB4. Regardless, it’s a helluva lot faster than my old USB3 SSD and platter setups with speeds of just 50-70! 

WARMThe enclosure does stay fairly warm, with added heat during backups. It’s not uncomfortably hot as I can easily tough the enclosure, but it is significant. I don’t have experience here so I can’t say if too hot or fine. Hopefully this won’t bite me later.
TO FAN OR NOT TO FAN
I was close to choosing an enclosure with a fan because I read lots of reviews about heat issues. I chose against it because there are even more complaints about whining noise and broken fans over time. I figured the fan would be tiny and prone to breaking with replacements hard to find. Then, I’d end up with an enclosure without a fan anyway. I’ll have to see if the heat is a problem over time.

SATISFIEDAll told, this setup seems solid, fast, easy to re/use, and is recommended. Biggest issue maybe heat though it may not because it’s actually normal temp.

EL artículo es excelente, cumple con todas mis espectativas. Gracias.

When I originally received this enclosure it was missing the heat pad and the usb-c cable that was included was short and only capable of usb 2 speed so when I wrote my original review I complained about the low data speed (30MB/s) and the missing heat pads and only gave the product 3 stars. The enclosure was fine, the accessories were bad or missing.After a long email correspondence with Acacias Customer Support, which included pictures of what I received, they told me that the cable I got was not their cable and so I thought I might have received a device that had been shipped to someone else and returned without the heat pad and with a useless usb cable, and I ordered a replacement. The Acacias product package was not sealed so it was not possible to tell if it already had been opened.The replacement just came in and when I opened the package (it was also not sealed) it contained a proper Thunderbolt 4 cable and the heat pad, and when I tested it I received the kind of speeds I expected - about 2800 MB/s using the WD 1 TB 2280 memory. That makes it clear that I received the bad usb cable due to my original order having been returned to Amazon by another customer and not due to the fault of the vendor, so I have revised my review. This enclosure works very well, although it does get very warm and probably needs a cooling fan as well as the included heat pads. The speeds are everything I expected and the included Thunderbolt cable works properly. It is a bit short for me, but it is the length specified in the product description.I am happy with the replacement and feel capable of recommending it. If you want external drive speeds close to the speed of your computer memory consider this enclosure.---------------I recently bought the version of this enclosure that contains a fan for cooling and when I tried to leave a review Amazon told me that I had already reviewed it, although that version was the version without the fan, so I am adding this review to the end of the original review.While the original enclosure is a great way of adding high speed memory to your system it suffered from one drawback and that is it needs cooling. I solved the problem by buying a small muffin fan and attaching it to the enclosure and, with that, it ran cool and I had no heat issues. This new enclosure solves that problem and I have replaced the version without the fan with this one.This is a first class enclosure with transfer speeds as high, if not higher, than the internal memory of my Mac M2 Mini. Repeated use of the Black Magic speed app showed no slowdowns due to thermal throttling so it is dependable and fast, even after long use.Thee are some minor issues. First, the manual that comes with the enclosure is the manual for the version without the fan so it contains no information about the cooling fan. There is a small button on the side of the enclosure to turn the fan on and off, but even when holding the unit next to my face I could not feel air moving. To be sure that the fan was working I had to hold it next to my ear, and I could hear it running.There is also a small LED on the side of the enclosure and it shows a constant light when the fan is running and a blinking light when the fan is not running. I have picked up the enclosure during the day and found it to be slightly warm while the old enclosure was hot to the touch without the muffin fan I attached.This is a great enclosure and I believe that it deserves the 5 stars I have given it.