Like Jim said. Get your car on a lift or put it up on jackstands and do a thorough inspection from front to back.
You also might want to buy a grease gun and make sure that the tie rod ends and ball joints have been properly greased.
# of grease fittings
If the spinners were installed correctly, it's unikely that you'll run into an issue with a spinner coming loose. Do a quick visual inspection of the wheels each time before you drive your car to see if there's been any movement.
You may also want to check/retorque the valve covers and check that the bolts on the water pump and alternator are snug.