Seeing as how the Microsoft-branded Data Transfer cables are getting pretty rare (and pricey!), I was a bit skeptical that this one would actually work. But sure enough, plugged it in and from the first try I got the well-known pop-up on the Xbox360, so the cable has no issues being recognized as a real Data Transfer cable.
The fact that you can use it for old (Classic/Arcade/Elite-model) as well as new HDD's (Slim-model) is a big pro, if I ever get a new Xbox Slim I don't have to look for a new cable to match :-)
Overal: Big thumbs-up, it costs less than the official Microsoft-branded cable, works just as well and can be used with both models of HDD's!