I have the Charcoal Smoke finish and it's not too bad.
I don't notice any reflection off the speakers (there is some if you sit waaaaaaaaay off either side, but that's more of a cramped space thing, my speakers are right next to the screen isntead of say 2ft to the left :P)
I do notice reflections off the bottom of my center. That's only because it's mounted above my screen and due to space restrictions (and the bolt being stripped) I couldn't move it up some so the projector (ceiling mounted) reflects on it a bit if I have the picture up to high.
So basically if your speakers are spaced away from the screen, you won't have a problem at all. Walls / treatments are a good idea. I have black cloth from the bottom of the screen to the floor and it absorbs light beautifully, I wish I could cover my whole room in it