It's hard to say at what point we can say "this is version 1.0" but people have been running many mints and loss of funds hasn't happened yet (only due to bugs in wallets, but not in mints afaict).

We've fixed a bunch of problems early on and it has proven to run pretty stable so far. Wallets are still being developed heavily. Protocol is being extended as we speak.

One option would be to tiptoe into running a mint and keep it small and internal to see how it proves itself.