The right size tamper is a necessary tool for great results with your Vitamix...just remember to place black lid on canister BEFORE inserting tamper.  Otherwise the blades eat the tool, your recipe is full of ground, chipped plastic, and then you get to buy a new one from Vitamix and place a review for the whole Vitamix world to see.  Follow the rules, place black lid prior to using tamper...I will?  Hopefully, I won't have to ever buy another one!