Initial thoughts as only received today!
Seems well made but no long-term assessment available.
USB 3.0 type-A (normal one for computers & laptop) at one end. USB type-C (reversible) at the other. 2m cable (i.e. typically double the length or more of cables you would get with your mobile phone). No more annoying Windows "...you can transfer faster if you use a superspeed USB 3 port".
Note the blue connector colour – you must have similar port on your computer to get the speed benefit of the cable.
USB-C connector feels a little tight on removal but inserts fine.
Crude transfer speed test (win 7 standard desktop copy/paste from normal HDD to Samsung S8 internal storage):
310MB file approx. 8s (USB 2 cable with USB-C adapter)
310MB file approx. 2.5s (olixar cable)
So, approx 3 times the speed. Happy with this.
I'd imagine theoretical cable transfer to be 5Gbps (due to being USB 3.0).
Transfer test almost certainly bottlenecked by HDD.