Mags have a look and feel about them that rings of mechanical things in sci-fi movies, right down to the little *PING* you hear once it's gassed up. I'm completely nuts for the polished nickel-plated look, especially with the oversized steel braid running to the valve. The kids love the look of my Mag too.
Then I pass it to them to feel the weight. It's a classic mag body with a steel grip and valve, and a steel tank out the back.
One kid asked me if it's how I got so big.