Yeah it's handy being able to mount ntfs file systems in FreeBSD. My desktop can boot either Win or FreeBSD and there's a disk in it that's mainly for storing Windows stuff. Every now and then I mount the ntfs volume in FreeBSD to move something to or from the Windows side.
Though I would not normally auto-mount that ntfs volume in FreeBSD or use it for any heavy work since the implementation is reverse engineered. In any case it's never caused any problems for me. They don't seem to make changes to ntfs much and the ntfs-3g implementation seems pretty solid. I think they're kind of locked in since any major changes could break stuff on older instances.
Though I would not normally auto-mount that ntfs volume in FreeBSD or use it for any heavy work since the implementation is reverse engineered. In any case it's never caused any problems for me. They don't seem to make changes to ntfs much and the ntfs-3g implementation seems pretty solid. I think they're kind of locked in since any major changes could break stuff on older instances.