Even at early bird pricing (39,-€) I'd rather get a cable that has the specs I need.
This seems to do a little bit more than simply list the specs (show shorted pins and whatnot), but it doesn't do any kind of load testing (tests like does sending 240 watts over the wire somehow interfere with the data transfer).
Most of the cables that I have lying around are USB 2.0 100 watts PD, as that's what most devices come with that have a cable in the box. For other cables I know what they're capable of because I read the spec sheet before purchasing them.
This might be useful to shops who sell refurbished phones that want to quickly check whether used USB-C cables are still good, but I don't see why anyone would want this for personal use.