These things makes skeptics just because most of us just don't understand them. How they work, comm, or interfaced etc etc. It's harsh to come to a conclusion that the item is crap just because you've never tested, tried or even understood how one works :/
Porsche DME encoding and comm protocols aren't from another world lol. They use very common protocols same as all the other auto-makers. Tools like programmers, yes they work. All of them does and that on the most advanced Porsche ECUs/DMEs equally - being the norm at every reputable tunner's shop. You simply need to interface those comm devices with your favorite ECU flashing software ($100~$5,000 widely available softwares). Where is the too good to be true? Please let me know if there are any other ways to logically interface modern cars
Factory Porsche Motorsports' ECU chip utilities (software) are all over the place last time I've checked. Porsche utilizes mostly k-line and CAN comm.
Just saying this because.... if you want to reset your airbag, cutoff a set of O2, tweak your maf, boost/adv your turbos, air/ fuel remapping. etc etc etc. You can just buy yourself a cheap Alientech K-tag or similar programmer. Download "the entire" ECU file into your software, mod it to crazyness level, re-upload into your car and off you go.
You simply keep the original car file safe into a backup folder somewhere. In case "crap" happen. But nothing will "explode" like some may imagine
(teenager stuff mate)
So... yes, most of these little eboxes works. Given you got skills searching the internet RE how they work