Pretty sweet indeed, but I'd agree with pain and earthquake that it's a bit noisy. It also almost seems that the paint has a bit too much of a spec to it, these tanks are completely matte flat. Shine just attracts the enemy. To me it almost feels a bit more like a battered and worn screw head, or something else metal thats…
I'm with Earthquake on that one. It does look like there is a bit too much going on in the metal areas. I think dirt and scratches make things look more realistic, but at a certain point they start to detract from the model and draw attention to themselves. Some of the "noise" throughout the texture just seems to jump out…