Happiness is disassembling your new used 15" planer, puzzling over conflicting instructions and videos that completely gloss over the hardest parts, installing a shelix head, reassembling it and having it actually work.
Joy is knowing that there were no left over parts!
My Griz G1021 planer now has a byrd shelix. While there were points where I doubted my sanity in doing this, the end result was truly worth it. It's so quiet and the cut is super clean. The old head would make a mess of jatoba, now it comes through close to ready to finish.