You will get a better idle and slow speed running ime with the precious metal ones like iridium, but 4 times the price, I think it's worth it, still very good with the 071, just that little bit better imo/ime with IK range.
Fuelling needs to be spot on though as the IK range are hyper sensitive to fouling I've found and don't recover often if heavily sooted, and defo not if ever made wet.
tabetha