As a regular at Hammer's, I definitely recommend it - $15 to park (same as the stadium lots), but you get relatively clean and no-line portajons, the peace of mind that your car is somewhat safe, quick access to Abbott after the game, and of course, Hammer himself.
When we're in the area, I usually try to make it to the lot 8-8:30am...last week, we drove straight up and made it ~11am, but still managed to get a good parking spot.
I recommend a trip over to Lot 1 ~11am to meet the other Wallers and see Kenny and the Pinto.
Be sure to bring extra food for after the game, as there is no good reason to hurry on your way...might as well enjoy it in the lot rather than sitting in traffic.