Product review (5 stars): Great Kit - Smooth and Quiet Operation Again!
This is exactly the kit I needed to repair my washing machine.  I had replaced just the dogs previously, but the repair did not last very long (maybe 6-9 months).  Apparently it really does help to replace these parts as a kit to reduce the overall wear on the agitator dog assembly.  The only part that is missing from this kit is the thrust washer (Whirlpool 285587 Washer).  Just make sure you do your research to ensure you get the right parts for your model of washer.

The repair was actually super easy, with just a flat-head screwdriver and a socket / ratchet.  I think it took me less than 15 minutes total to disassemble, clean, lubricate, and reinstall.