I'm a huge metalhead, and I started my audiophile career with the Denon D2000s. I've always been looking for my perfect headphones (already done) and I've seen Grados recommended for metal specifically more times than I can count. Every time I see someone who listens to metal, I go to their profile, and sure enough, they own Grados. I adore Metal, everything from Black, Death, Prog, Symphonic, etc and I cannot grasp the popularity of Grados. I finally bought a pair of SR225i's to see what all the fuss was about, and here were the results.
Comfort: Abysmal. How anyone can wear these for hours is beyond my comprehension. My ears were hurting within 2 minutes.
Sound: Yes, they're upfront and fast with decent impact. Yes, they're energetic. But so are plenty of other headphones (hint: Denons, beyers, audiotechnicas, ultrasones). I wasn't about to compare them to Denon D7000s so I pulled out the trusty old 2000s and did some A/B. Not for a second did I prefer the sound of the Grados. They're not much faster, if at all, they don't have more energy, they don't have as much impact etc. Nothing special really. I could have done further testing, but I was worried my ears would start bleeding.
Unbelievably uncomfortable and not better for metal than many other also-energetic cans. So why are these so often praised, especially for metal? I am really curious.