TSPP is a amazing pin, and well suited as a home machine as it takes a long long time to learn all the rules and the different ways to play. This game is soooo deep!
As a owner of a TSPP, there a couple of things to watch out for. Make sure that the orange plastic couch is not cracked or damaged, it can rub and catch on the side of the cabinet when the playfield is lifted up and lowered. The Garage Door decal does get worn by constant ball hits. I have had not had any problems yet, but get a couple of the forked micro switches for the various VUKs as they do tend to break.
The clear orange ramps, especially the Treehouse Ramp tend to break up from ball hits and are expensive to replace. Check that this ramp isn't cracked where the Comic Book Guy stands. The plastics are fairly fragile, examine the long plastic down the right hand side of the machine for cracks. The Quik-E-Mart island plastic gets broken also.
Make sure that all the character models are in place, and that Itchy and Scratchy have their appropriate weapons in their paws!
Also check to see if the Garage Door "droops", that is it doesn't stay fully open after being hit by the ball. A stronger coil can fix this problem if it does droop. Test that the ball doesn't get stuck before it is kicked up to the upper playfield, and that it is kicked up cleanly on the first attempt. I have previously had trouble with weak upper playfield flippers, make sure that the long flipper spindles do not bind on the edges of the upper playfield.
Otherwise this is a good reliable Stern machine. Purchase and enjoy!