My opinion is they are good tyres and with mass production every now and then 1 bad one may get through. Shouldn't happen but that's reality, it could happen to any brand. I'm on Pirelli at the moment but I'd still be happy to use Dunlop again after that but there is a mental element to tyres as well; if you don't trust it you won't be happy. Go with something else if it makes you feel better but I think it would be psychological.