Curious how robust the (what looks like PCIe edge connector slots) connection to the drives is in practice. Obviously converting from the horizontal mainboard

Curious how robust the (what looks like PCIe edge connector slots) connection to the drives is in practice. Obviously converting from the horizontal mainboard to a vertical drive requires such a connection, making it a plug-in card at least allows for replacing the card if it breaks/wears/etc, and mounting the front of the adapter card to a bulkhead should prevent much shifting of the card in the slot. Neat design and reuse of a cheap high speed connector.