If your ignition and fuel systems are working properly you won’t notice any difference between these or any number of equivalent quality plugs. We have carefully tested $2 Bosch Platinum with six weekends on them against new NGK iridiums and found zero measurable difference. Much more important is to learn to read plugs and pull them out occasionally for inspection.
Steve, any opinion on plug wires? (I've used Nology, which are more than enough for me)