The super 4 - with 4 ground electrodes are just long life plugs for people who cant be bothered checking the electrode gap.
As they spark the gap increases as they gradually wear away. Thw spark always jumps the closest gap, so when one electrode wears away, it jumps to the next nearest. As there are 4, they last 4 times longer before you need to regap them.
However, plugs do have limited life, and Ive always found its best to replace the whole plug before you have regapped them that many times.... I also like to check plugs, clean, regap etc as checking the plug deposits as be a good indication to how well the engine is running and you can even spot problems depending on the condition of the plugs
I did buy a car with Super 4s fitted, and promptly replaced them with NGKs because you dont know how long they have been in the car due to them being a long life plug.
Id also recommend going to a motor factors rather than have Halfrauds losten your belt and have your pants down over the price of them