This weekend I replaced the Geetech spiral head I had in my Ridgid jointer with a Byrd Shelix head. The change was easy, popped the bearings off, and put onto the Byrd head. Tuned up the jointer a bit, cleaned it, waxed it. Installed the new head in about a hour, and adjusted everything. It runs quieter, and the cut is great. There are no lines from the cutter head, but still would need to hit with a plane to finish the edge.
Its not as a quick as the old head, seems its a bit slower in pushing the work thru, but maybe thats me.
For $250 its brought a bit of new life to my jointer, and beats the money on a new one for now, and I am happy with it.