Those coils are reliable. I generally don't recommend replacing GM coils unless there's a circuit code for a specific cylinder, and I try to confirm that by swapping coils. Random misfires (P0300 Code) are almost never the coils. Cylinder specific misfire codes should swap coils around with the new plugs to confirm. The plug usually fixes the misfire. The code might move with the coil, indicating the coil is the problem. Or the code may stay on the same cylinder, in which case the wiring and fuel injector need to be checked.
Pros: reliable performance
