Although this slogan is not exactly slick (it’s a bit of a mouthful), it is unusual not just because of its longevity, but also because it’s a firm promise to the customer, rather than an imperative of how the customer should live their life, in the style of something like Just Do It, or a statement of attitude or belief as in Life is for Sharing.
The point about a customer promise is that, even if few customers go to the bother of asking John Lewis to refund the difference on an item bought more cheaply elsewhere, it builds trust in the brand and demonstrates serious commitment to its users.
Of course, shopping has changed beyond recognition since 1995, let alone 1925, and in these days of online retail giants and price comparison platforms, the slogan itself could not sensibly survive. John Lewis have undertaken an 18 month brand positioning process to find a replacement - something that will attract new and younger customers to the retailer.
With my nerdy branding hat on, I must say that it was fascinating for me to see the fruits of this year-and-a-half of branding labour. Some of the positioning statements/slogans (the source articles don’t make it completely clear whether these are strategic/internal or executional/customer-facing) that were considered were these: