I replaced the cutterhead on my 6" jointer several years ago. The procedure was easy enough, but I would suggest that 1 other person to help, as the directions call for, is essential. On an 8" or bigger jointer, don't even think about trying it alone. Yes the results of the new spiral head cutter are great, noise is reduced and sharpening blades is very distant in the rear view mirror. On highly figured wood just remember to take minimal cuts as possible, you can still get tear out with too aggressive a cut.