Yes I use it in many circuits and have Haskell and C++ libraries.

Only using it for digital signatures though, not all the other stuff it does.

You understand it only does the one NIST P256 curve? Not nostr/blockchain Koblitz curves?

NIST is a swear word around here sometimes. Like, it's teh evil gubmint that brought us the fed and such.

For Koblitz curves you'd need something like an NXP SE050, much more versatile, haven't used it in anger yet.