The Poormans Brookstone!
That is the most apt and best description of BB&B I can think of, and although I didn't come up with it, if you never hear it from anyone else feel free to attribute that description to me!
BB&B has the rare ability to make even me, a person who thinks almost all products are crap, want practically every single item I see in the store!
Like any store they have stuff that is over priced and not really worth purchasing there. But if you're going to BB&B to buy sheets, you either don't have a price point issue, or you've not learned the secret that is Ross or Marshalls.
I only go to BB&B for the &B and that's where they win at life. Desklamp with plastic attachment that can hold tons of crap and help me be more organized? Awesome! Hideway under the bed storage bins? Great idea!
The only complaint I've ever had about BB&B is that they can't have in store at least 1 of everything they have in the catalog :( I have to see it in person. A catalog only is just too risky!