I have a Hammer a3-31 with the silent power spiral head. It is probably the only thing I really like about the machine. My boards come out glassy smooth and I can go right to higher grit finish sanding.
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I have never used tera knives so I can't compare, but I personally don't feel like the spiral head leaves anything more to be desired from a finish standpoint. Whenever I eventually replace the hammer with a better machine, I will be sticking to a spiral head.
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Larry Long Neck
Just a noob trying to learn the ways of wood
> Making youtube videos now!
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Larry Long Neck