impressive. thats all i can say.
they have metal engraving tools other than lasers too. its like giving sheet metal a tattoo, without ink. i used one of them to engrave a ring once. it gets you good results too, and you can probably control the "shading" better than a dremel. i dont know if you can do steel, but i know you can do aluminum and copper.
but anyways... that silver on black really does it for me. ive always like silver on black.