Materials: Most AA grades use 316L Stainless Steel, which is decent and corrosion-resistant, but they rarely use the precious metals (gold or platinum) found in genuine Patek Philippes.
Glass: You will likely find Mineral Crystal or a "Sapphire-coated" glass rather than the pure, scratch-resistant Sapphire crystal used in high-end "Super Clones" or originals.
Weight: It will feel "okay" on the wrist, but it often lacks the density of a real Patek. Genuine Patek Philippes are meticulously balanced; a mid-tier replica may feel slightly "top-heavy" or have a "jangly" bracelet.