Anyone saying beats pros won't be driven is full of it. They are way to damn loud even at 50% on my iPhone. In the end I think you should look into cheaper headphones. If the sound on the beats pros don't drive you crazy the comfort will. It's like having bricks on your ears. But I think they sound alright if they were under $300. If they went for $250 they would be average.
You do realize that "loud" doesn't mean fully driven. I can make the HD650s sound loud at 75% or so on my iPhone, but that doesn't mean they are fully driven