I just bought one from Brainchip. They seem pretty good. I asked them some of their use cases, they have some videos on their YouTube on classification tasks of images of beer bottles, but they seem to be the same kind of tasks you can do on a regular GPU.

Brainchip PCI chip is interesting because you can code for them like regularly, and then send the built neural network to the chip and convert it from a CNN into a SNN, but there doesn't seem to be a great reason to use it this way. It seems like the main use case would be to run a native SNN on it. NPUs don't seem to scale the way GPUs do though either.