I purchased the HF Predator gas two stroke auger, came with a torch plug. I use it for fence posts, live stock pen poles and planting stuff around the house. After one and a half tanks of fuel the plug went bad and bought a NGK replacement which has worked fine ever since. However, I also have the first gen HF 2500/2200 inverter generator which also came with a torch plug, it ran for three years without a problem. I changed it to an NGK just as a preventive measure, since it will be run for hours when its used. So in my experience, the torch has worked most of the time 50% of the time.
If anyone is interested in the performance of the gas auger, its terrible. You would probably be better of renting one.