they are a waste of money, the spark will only reach the electrode that is closest (were talking less than a thousandth of an inch) I was told at work that the company was sued because of their bogus horsepower gains. Supposedly they switched the plugs out of cars that have dirty plugs that have probably never been changed, which I could see making a 20+ horsepower difference. If there is no additional energy fed to the spark plug, the spark will be just as powerful assuming the gap is the same. If they are claiming that they will last longer because they have 3 electrodes I dont beleive that either, because the unused electrodes would gunk up due to their lack of use, so once the one that is being used gets gunked up, itll be time to change the plugs anyway. I've also seen a new plug called pulse plugs or something along those lines. Kind of like an MSD box built into each plug. Those (provided they work) could make a difference, but I would think only in older, carbureted cars.