User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-24098614-20150726094045/@comment-26285797-20150726165616

It is Issei's alternative to the JD and clearly surpasses it even now. It was said that CCQ was more powerful than JD, but I always had my doubts about that, but the DxD form is clearly stronger. But back to DxD as an alternative to JD, since it is an alternative, I doubt that it will use up Issei's life or sanity. If I had to guess, his body's just barely able to handle the power of infinity, so the damage he took from sustaining infinity for that long must be incredible, but most likely not life threatening. All Ishibumi said was that Issei was enduring pain that was more agonizing than death.