For those that care about details, the correct name of that item in the eBay link above is the Foxwell NT520Pro. They also make an NT520 (not Pro, not 510), which is different. From the photos in the brochure that comes with the product, the non-Pro version has the protruding buttons like the Schwaben one does, vs. the buttons shown in that eBay ad. I don't know what other differences they have, but there are two types.

I got two NT520Pro's off eBay a month or so ago, for $121 each, one for my Porsche, one for this BMW. I could have got a single unit with software for both, but this way, I just leave them in the respective cars, and don't worry about needing it and not having it.

Happy with mine. But I have noticed the NT510s are offered for at least as much as the NT520Pro's, and I don't know why - although it could just be inertia from previous pricing.

__________________
2001 X5 3.0i, 203k miles, AT, owned since 2014