Today I saw an e-mail from Jean-Pierre André. He is very active around illumos NTFS-3g kernel module. Please use and test.
Link to Jean-Pierre André's e-mail.
Content pasted below for convenient read.
If you'd like OpenIndiana to support NTFS out of the box, please comment on https://www.illumos.org/issues/1721
I am now releasing the fuse kernel module for OpenIndiana. Ntfs-3g