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Unfortunately SoloKey doesn't work as an OpenPGP smart card, which means it's not a real substitute for a Yubikey. I haven't had any luck with resident FIDO2, either.

The Solo team believes that other functionality such as PIV overlaps with GnuPG use cases, so that OpenPGP isn't a priority, and their work on that functionality appears to have stopped in 2021. That's too bad, because OpenPGP's network effects far outweigh its pure functionality, which means a technical substitute isn't a substitute.

https://github.com/solokeys/openpgp

Unfortunately my solokey2 is buggy even with latest firmware. Hw is much better than solokey1.

But there are indeed alternatives to yubikey. Anyone have experience with https://www.token2.com/shop/product/token2-t2f2-fido2-and-u2... ? 128 resident keys is much better than 25/50

I've found Solokey to be unreliable. Recently, for example, I learned that the Solokey 2 can't be added to iCloud as a security key

I have multiple Solo Key 2 devices. (I bought a Kickstarter 4-pack.) I use one of them regularly, and I successfully added it to iCloud as a security key. It has been 100% reliable.

In August 2022 they released a major firmware update. Maybe that addressed the iCloud incompatibility and reliability issues?