The NVMe storage is the second generation of the SSD which comes after the hard drive. The NVMe is much better and faster than the HDD and the SSD. There is no mechanical component that moves which make it more durable in case of handeling shocks. Review collected by and hosted on G2.com.

From my point of view, i don't see downsides for the NVMe. It is fast reliable and has low latency. The only thing that can be pointed to is that it is expensive. More expensive than the SSD. Also, it is not compatible with all laptops, if your motherboard isn't "new" you might face compatible issue Review collected by and hosted on G2.com.