Wow, such harsh words! Hey, the wrench works! Plenty of leverage, and there is no "mine shaft" for the wrench to fall into that it cannot be retrieved.
Go ahead and pay the $120 for the factory wrench, or have the dealership change your oil for $250! Hey, you get what you pay for! ($100/hr for an easy job) When you do it yourself, you KNOW it was done right!