A tiny, inadequate lens hood, made of metal, and guaranteed to increase the chances of seriously f*****g up the lens in the advent of any kind of mishap...tripod dropped? Monopod dropped? Camera and lens dropped? A solid, unyielding, non-flexible, threaded on metal extension of the lens barrel? A cheap aftermarket lens hood that can help damage the lens, or even worse, rip the lens mount off by NOT absorbing kinetic energy? A cheap, aftermarket "metal" lens hood, so that one can channel every single impact, every single blow, every single dropping of the camera directly into the lens, or even worse, through the lens as a lever, and all the way back to the lens mount?
Drop a long, heavy, large lens onto the ground, or have it tumble or topple...and the FACTORY-designed, FACTORY-engineered, NIKON-approved polycarbonate lens shade will act as a shock absorber and bumper...and will slow the lens down gracefully, and maybe pop the hood off at the bayonet-on fittings.
Want to replace the lens? Want to have the mount repaired? Then buy this metal hood. Want to do $1,000 to $2,500 damage? Then by all means, rush out and buy a metal, screw-in hood.
Putting a cheapie made in CHina e-Bay metal cheapie on a big, long, heavy tele-zoom lens. Not a smart idea.
The idea that a metal, threaded on lens hood is "better" than a polycarbonate, impact-absorbing, protective, adequately-long hood specifically designed for a fairly expensive, lengthy, potentially leverage-inducing, five pound lens? Dumb. Very,very,very dumb, and utterly ignorant of WHY car bumpers, home trash cans, and so many things are now made of plastics and polycarbonate materials, rather than metal.