For something as common as unlocking my phone, the algorithm needs to be extremely fast and power efficient not to mention this is a PHONE, so yes I still find this impressive. The fact that sensor data is being processed through a neural network using a dedicated chipset for neural net operations would seem like ridiculous overkill if you explained it to me ten years ago. Furthermore, the network is actually being re-trained on the fly to accommodate for changes to the users facial hair, etc.