Haha! Good point Kevian, I'll definitely post some photos.
About my favorite genre not blooming on this setup - I personally believe that a lot of impact in metal music is almost physical in nature. You need to feel the music as much as hear it. I'm not talking about feeling it emotionally, rather, physically. Basically, what I'm trying to say is that metal has got to be loud. Face meltingly loud. Floor shakingly loud. Leather bound, primal, screaming like a Banshee LOUD.
Now, that is something which I think can only be reproduced authentically at a live concert. Therefore, I end up using my ATH-M50s at work to listen to all my metal (like a fix for a druggie) and then come home and kick back to listen to some milder, easier listening music on the Syrens.
That said, however, I listened to Nirvana's outstanding album Nevermind at pretty loud volume yesterday and when Dave Grohl goes all savage on Breed's opening riff, the reproduction of the music is solid, spot on and enjoyable. Would I head-bang to it though? No. That is something that needs much more SPL, attack and edge.
Do I want to build a stereo system that does well for metal? No. I much prefer the balance this system provides me. Plus, I have other family members to care about. My wife appreciates heavy metal but fatigue sets in pretty quickly. That is another reason why I ensconce myself in my headphones and let metal work its magic over me.
I've blathered a lot. Let me finish by giving an analogy that works for me: If you go to a Norah Jones concert and then come back and play her record on my system, you'll still enjoy it immensely. However, if you just survived a Lamb of God concert (were you there?) you CANNOT reproduce that feeling physically, at home.
Cheers!