Paragon Software's NTFS for Mac 12 is another excellent choice.
NTFS for Mac costs $31, and you can download a demo first to see how it does. It uses smart caching to keep data transfer as fast as possible and works with every OS X version since 10.4 (Tiger). Tuxera's NTFS for Mac is one of the best ways to do it.
Whatever the case, the good news is that it's not a show-stopper: There are a few utilities out there that will enable Macs to write to mounted NTFS volumes. Maybe the drive you're using has to be used with a PC occasionally. Obviously that solution doesn't work for everyone.
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