I wouldn't use a password manager system that doesn't have the ability to change the master password.
EDIT: You can't change any password really, without changing all of them (or having a separate master password). Seems unpractical as soon as, for example, site X gets its database hacked.
EDIT: You can't change any password really, without changing all of them (or having a separate master password). Seems unpractical as soon as, for example, site X gets its database hacked.