My experience comes from actually writing the ports as opposed to using it in other places. I’ve gotten issues like the UDP checksum generation breaking in the raw API at higher speeds or DHCP packets managing to come out corrupted, and in both cases I fixed it by just replacing the code that’s responsible. I’m not claiming this is representative of anything in general however, these are all for somewhat esoteric networking analysis in an academic setting. It definitely works well when you just use it as intended on microcontrollers however and I’ve never had issues when I’m not doing awful things to it :)