Cable Matters40Gbps USB 4 Extension Cable 0.5m, True Reversible Design, Works with Thunderbolt Port (USB C Extension Cable/USB C Extender), Compatible with Thunderbolt 4 Cable

Its a solid extention. Im using it to extend a VGA adaptor from my laptop stand. The only downside being its very thick and hard to bend in comparison to a normal cable. I havent tested the data rate on it yet but works fine for connecting a screen .

Pretty good quality and does the job. Unsure if it's due to the cable or the nature of USB-C, but you can't seem to daisy chain them.Other than that, I recommend this if you need a quick extension on an already existing cable.

Working breast with my dell thunderbolt docking station no complains supporting monitors and all other operations good quality

Finally, a fix. This cable is the answer to my Thunderbolt audio interface's annoying disconnection when my Mac mini (M4 Pro) sleeps, locks, or when the interface turns on after the computer. Before, I had to reboot or risk scratching my Mac by yanking the cable. Now, I just pull this cable's connection, and my interface is back. Five stars

... to my laptop, since the hub only has a short cable. I've got a power supply, mouse, screen, external disc etc plugged into the hub, and everything works as though the hub were directly connected to the laptop - bur now I have more freedom in positioning the hub.

This ‘USB4/Thunderbolt’ compatible extension cable arrived in the standard Cable Matters branded grip-seal pouch, with some relevant printed documentation and the cable itself neatly coiled up and held with a couple of twist ties.As usual from this company they’ve made a good quality cable, it’s made from a believably thick and well insulated cable that gives credence to the claims of it being able to take 240W and 40Gbps transfers while still being fully reversible. You do have to pack a few extra conductors in there to satisfy all of that, and they’ve done it well here while still having a soft outer sheathing and very flexible friendly extension cable. Like the rest of the cable the connector and connector bodies are well made and have suitably stiff strain-relief built into them. They also have a compact shape that makes the male end a non-issue for even the tightest ports.Annoyingly there isn’t any identifying markings about the speed or wattage rating or any spec of the product on the cable ends, so once this goes into a box or bin of similar looking cables the chances are good that you won’t remember which one happens to be the USB4 40Gbps extension. I’ve got into the habit of labelling or otherwise marking unmarked cables with a drop of coloured paint or nail varnish, but that really shouldn’t be necessary and USB-IF has dedicated USB4 logos for a reason. I suspect the real reason they haven’t got the USB4 or Thunderbolt logo on this is because it’s a dumb pass-through extension cable and therefore wouldn’t technically pass certification as it doesn’t have an e-maker chip or any other of the active circuits required. To their credit they haven’t actually claimed that the extension is USB-IF certified, just that it’s compatible with cables that are certified. It doesn’t really bother me but even a simple 240W and 40Gbps marking on the connector body would’ve been appreciated, it didn’t need to be the USB4 & Thunderbolt markings or nothing.I’ve had no issues with PD3.2 charging through this and there hasn’t been any noticeable impact on any transfer speeds to and from a Thunderbolt drive and other devices, so it does do what it says on the tin for both data and power. Which makes a lot of sense if this doesn’t have any active electronics inside it, it’s just passing everything on and the transfer and wattage is going to be strictly limited by the devices, cables and power sources attached to it.Overall I've got no major complaints about how the cable works, if you’re looking for a 50cm long pass-through for practically any device this will work just fine.

Used to extend the connection on a Thunderbolt 3 dock for a laptop. Works great, powers the laptop and no issues with any of the dock functions/external screen etc.

I have four M.2 NVMe enclosures attached to a USB-C hub which was experiencing problems. The Cable Matters USB extension fixed what was most likely a bandwidth limitation of a cheaper cable.