I think that was a miss print?? At 350 its still a very good deal. I recently installed this Byrd head. The smaller one is just so much easier to install. Don't need to remove 40 cutters and reinstall to get the shaft in.
After running the spiral head I am impressed with the cut difference as you might imagine but equally gratifying is the dramatic reduction in noise. The straight blades are very loud. This is a plus in itself.