I have had two sidewall failures with these original equipment tires on my wife's G80 Sport. In the first instance, my wife struck a pothole at about 5500 miles and damaged a rear sidewall, causing a visible cut. This tire was replaced by the dealer with no offer of financial assistance from Genesis or Continental, although the former arranged a free tow. The dealer provided a loaner and delivered the car to me when the new tire had been mounted and balanced. Yesterday I noted a bulge in a front sidewall with mileage at about 6100 miles. I was driving and do not recall striking a curb, pothole, or other hazard. I contacted Continental, who will provide financial adjustment of an amount depending on whether or not the dealer finds a manufacturing defect when they replace the tire tomorrow. The replacements will be Michelins purchased from Tire Rack so as to remove one variable. Tire Rack say that they have not noticed any unusual number of issues with the Continentals, though, and that the sidewall problems are more symptomatic of low profile tires. While I have not seen any problems with the the original Michelins or two replacement sets of 19" Bridgestones on my Porsche Carrera S, my son has had all four tires replaced due to sidewall failures on his Audi RS7, which has 21' wheels, so maybe there's something too what Tire Rack say. He purchased wheel and tire insurance, which it seems I should have done. I am very happy with the way the Genesis dealer has assisted and hope they will remain a dealer.
Update: Dealer believes that the tire struck a pothole or otherwise suffered external damage rather than a manufacturing defect. Continental offered 50% of a new tire if I purchased Continental again; that seemed like the definition of idiocy to me. Therefore, I had dealer remove the original Continentals and replaced all four with Michelins I had sent to them from Tire Rack. So far, the ride and noise of the Michelins is not discernibly different from the Continentals. I filed complaint with NHTSA and informed Genesis of the events.