m.2 nvme ssd on pcie expansion card.

Does anyone have any experience how well m.2 pcie expansion card work? With the current prices of nvme it’s not that expensive get 4tb m.2 drives. Outright speed isn’t the most important, so it not big deal if some pcie lanes have to be shared. My ‘worry’ is that when I upgrade my computer it might not recognize the m.2...