For those of you concerned about giving them your phone number...it's for delivery purposes. Sometimes the label on a package can become partially illegible (smudged or scraped), and if UPS or EMS (or whatever) has your phone#, they can call to confirm the correct address. This happened to me once and UPS called me. I was extremely grateful I had included my number, otherwise my package would never have arrived.
Also, to the people who keep saying that the "NDS Adapter Plus" does the same thing...no it does not. The NDS Adapter+ does not support 3DS games, only NDS.
For 3DS games, this device device could be worth it's weight in gold just for the ability to overwrite the "permanent" saves in those Capcom and Namco titles (ie: Resident Evil and Pac-Man & Galaga Dimensions). The SaveDongle could prove to be very valuable if developers continue to use that hideous feature in future games.
And if someone eventually cracks the 3DS and we're able to play 3DS roms on a flashcart, I'll be very grateful to be able to grab the saves off my retail carts to transfer to my flashcart.