NTFS write on Lion or Mountain Lion
What works
Tuxera and Paragon sell paid NTFS solutions on a Mac that just work with the best performance. I however used the free version of NTFS-3G on Snow Leopard without much issues. When I moved to Lion though, there were some errors.. and MacFUSE wasn’t maintained anymore.
What almost worked
So, I tried fuse4x with ntfs-3g and while it works fine most of the times, sometimes I got errors with writing large (>1G) files on an NTFS volume. Also, automounting didn’t work fine—I didn’t bother to troubleshoot that though. If you want to try this approach, I suggest you do this through homebrew, which is a wonderful package manager on Mac.. sort of like apt-get on Ubuntu. Once brew is installed, just do `brew install ntfs-3g`. This is what I remember doing.. and I think it pulled up fuse4x, and associated kexts etc. Anyway, I did `brew remove` for ntfs-3g and fuse4x.

