I wouldn't get metal opus. It won't help me cause I'm a IEM user. Though it would be pretty slick aesthetic wise.Im struggling to see the price difference/value of going to metal from the opus1. Do op amps really make that much of a difference
I dunno, I will take Opus's word for it that OP AMPs will power Planar or juicy headphones better.
Though for something like Audeze LCD-4 I'd rather plug Opus 1 into an AMP. Maybe Metal Opus is super amazing at driving those headphones. Hopefully someone can chime in.