Ridiculous comment from the salesperson! A machine model determines the quality of the machine....cheaper machines are sold at Walmart etc. However a brand name/model numbered machine is the same whether it is sold online or at a storefront. I have purchased numerous machines online, from dealers who have website sales, all were "boxed" machines (aren't they all boxed).....true there are some plastic, cheap machines out there, but you know the model you want, so shop around. If you don't need the instruction, purchasing online from Amazon is fine...the warranty comes with a machine too, whether you purchase it from a retailer on amazon or at the store.
Ken's sells through Amazon, and Allbrands does too.....I would discount the information from the sales person.