What's the advantage of a reel with magnesium parts (like the rotor)? BassPro has an Aero Stratic MG spinning reel on clearance for a decent price -- lower than the non-magnesium models. Does the magnesium model provide any advantages? This reel would never see salt water, so that isn't an issue. Need a new steelhead reel (wore out the quantum and older shimano) and this one seemed to fit the bill.