Any game breaking bugs in longterm MyGM/MyLeague?

Thinking about starting one but wary of getting too invested if there are issues (e.g. with player progression/regression, team building, salary caps, draft classes, duplicate players, etc).

Also, which would you recommend between MyGM and MyLeague?

Oh, and can I switch an online save to offline mode later when the servers go down or should I just start with that?