It actually is available and works on my GTI though I am not sure about whether it is compatible with a chipped S4, but I don't see why not. It does have a $200 price point... But if Arin wants to help I am sure he can loan you one.
The problem with the dongles is that, at least amongst the GTI folks, it seems to "freeze" halfway through data logging. I personally haven't had the problem but others have. That said, though, certainly an alternative to VCDS, but I don't know if its just as good. Oh and you can only use iOS devices with the dongle.
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