I've to B&H's brick-and-mortar store a number of times. It's fantastic! I've only bought camera stuff, but the sales folks are not only extremely knowledgeable, they're really helpful. I once went in to buy a telephoto lens and mentioned a specific model. The saleman asked me what I'd be using it for, and with what camera. Based on my answers he recommended a lens that would be just as good and cost substantially less (and it was!). To me, it doesn't get any better than that.

As for checkout, I love the "Disneyland e-ticket" ride for whatever it is you bought -- it's fun to watch everything swirling overhead on conveyors.

Though I've bought from Adorama, and they're fine, my first stop, either in person or on-line, is always B&H.