I've micro and C devices and always care those tiny converter plug with me. If they aren't lost that is. So this is most certainly progress.
I can't find the length... Whenever possible I use 1ft cables. And that's because Anker doesn't sell 1/2 feet cables
Would I buy it? Never. The reason for that negativity is:
My USB-C device draws 4A and this cable is only rated for 3A.
I guess the cable is geared to QC which draws 3A max. But even then the cable is a bit underspecced because I prefer a little overhead.
The micro plug is good enough for most of my devices, but my laptop possibly draws exactly that or more. (wall charger is rated 3A)
So... I'm waiting for the Powerline II+