I don't understand why that is funny since this thread is not about headphones for you.
But those headphones don't sound anything like Grados for metal and rock. Safe? Maybe, but it's not that expensive to demo a pair by buying from Amazon. Meanwhile, the SQ of the MA900 and HD558 would be inferior for those genres, in many people's opinions.
Hmph. I said it was funny because i didn't recommend them... Well anyway, I have some SR80i's and nope, i prefer the MA900 for rock. Plus i can only wear them for like 45min. The only grados he can afford would be the SR80i or SR125i which apparently sound fairly similar so id choose the MA900 for rock/metal. SR225i may be a little different though.
I said they're safe because most people that get them like them (the same can not be said for grados). Plus there's absolutely no question that they're more comfortable, and they have a very nice, wide sound stage.