I put a 6" Grizzly spiral head on a 6" Jet jointer a couple years ago. It came out of their scratch and dent room. ZERO issues with it and it has worked flawlessly. Interestingly enough I picked up a Delta DJ-20 and bought a Byrd head for it from Grizzly and you can find the kudo's to them in another thread. The large bearing step on the Byrd was .020 oversize. Grizzly made it right and the head is now installed. It's safe to say that you absolutely can't tell the difference between the finish of the Grizzly head and the Byrd Shelix. I know it was a fluke the Byrd head had issues but the point is those who think that you are guaranteed better results if you pay more are sadly mistaken.