I play late nights a lot so I don't want to wake the neighbors. And trust me, when you have these things on, it feels like you've got your home theater system cranked up. The sound quality is amazing. Plus I can adjust chat volume and sound volume quickly and easily.

Do iiiiiiiiiiiiet. It's more challenging in my opinion. Once you Prestige your Multiplayer completion percentage jumps up as well. I believe I'm some where around 340% Complete. All the weapon achievements reset so it isn't hard to get all the 10,000 point ones and rank up fairly quick.