Curt, I had looked into getting one for my D200 because I like shooting tethered in the studio, but decided not to because the reviews out there are mixed. Apparently it doesn't download as quickly as the usb --some report significant lag time. You may want to google it and read some of the reviews.
I had tried using the free software out there for tethered capture and it just seemed to be unpredictable especially with lightroom 3.2. So I went ahead and got the camera control pro which I'm happy with and have it set up so that it auto-imports into lightroom. From capture to download is pretty quick.
Best Regards