Chances are your if the screen cracks or you drop it, or you spill orange juice on it and fry the motherboard, HP doesn't cover that. I would assume that Amex would only extend the HP warranty. If this is the case, try getting a warranty from
squaretrade.com with ADH. Use the coupon code THIRTY30 and you'll get a 3 year extended super warranty for $120. You should note, there is a deductable (I think $50) on all ADH claims. Good luck!