How you people opinion about First Impression???

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No matter who you are, a boss or a seller, when the time you want to meet up with new customers, the 1st time you and the customer meet, the frequently used sentences will be : "Hello Sir, my name is ABC, the representatives of the DEF Company, our product will help u to save money as well as make money....." After that give the customers an angel's smile, take a bow and hold his hand with full sincerity in order to win the goodwill of the customers, left a good impression on them. Is it necessary or a must to use this kind of way to make a good impression for your customers???