If the chippers had their width visible I would give it a 5.  I love the four blade chippers but setting up the desired width is a real challenge.  I recommend engraving the width after you determine the true tooth width.  But the cuts have a really smooth bottom which has been a dream.  I purchased the 6" since both my table and radial arm have adjustable blade height and I don't plan on cutting a dado deeper than 1/2".  But  then I am a beginner.