Seriously Thunderbolt on PC is a confusing and expensive pain. This product, in it's current state, should really be consider a MAC only product. Headers, connectors, risers, cards, TB3-2 adaptors, more cables...and then cross your fingers and hope it works? Please.
I'd love to buy a Quantum with it's features and low latency, but not with this mess going on. I'm hoping Slate can deliver with his PCIe VRS, or I may throw down on a RME because they at least know what they are doing on the USB side of things. If you want to sell Quantums on PC you need something other than Thunderbolt.