If this indeed works (it should, but a scam is always possible, especially on crowdfunding sites), there is still the possibility of Apple disabling them via a firmware update - which would scrap your upgrade.

I wouldn't trust this personally, Apple controls their hardware and software to the end: this is why it both works so well AND costs us so much at purchase time. An external TB 3/4 dock with drives is probably a safer and time-proof option.