Can uSync Migrations handle users? If not how are people handling that? Thanks!

uSync.Complete has member and user functionality, though it isn't free: https://jumoo.co.uk/uSync/people/

yeah v7 doesn't have an export users bit - so not really, but in theory you could create the correct xml . with some code in v7 and then it would import in v8+. but lots of issues around password hashing etc, that you would have to make sure about (v7 hashes the passwords with different algorithms, i think you can configure 10 to use the old hash algorithms, but not sure if its recommended)

I've done this with my own import/export code before, just using the user service via a migration. As a rule, when "migrating" I ignore the passwords and set them to a random string on import, then get all the users to to follow the "forgotten password" process. The benefit of this approach for security is that it: Automatically locks out dead users. Password rehashes with the new better algorithms so we don't have to care about that. Opportunity to prompt users to choose a new, better password.

I do this with the password too Jason.

I migrated some members from a v7 site to a new v 11 site not long ago. Wrote some code that connected to the old database and created all the users in the new database using the member service. Afterwards I updated the the db rows for all the imported member to use the old hashing algorithm we used the legacy passwords mode before. This let's all our old users still login. If someone creates a new account or an old user resets their password they will automatically be using a newer hashing algorithm.

Done this from v7 to v11 recently with the mix of https://github.com/Joniff/Our.Umbraco.uSync.MemberEdition and https://www.nuget.org/packages/uSync.PeopleEdition/8.11.12