Apple Store in Glasgow
It's not really a complaint, or praise, but I went to the Apple Store in Glasgow last week because I had a particular question about the Airport Express, and I thought I would at least get the correct answer in there. I wanted to know if I could stream music from my Apple TV to the Airport Express without having the computer on, as I often go days without switching it on. The "Genius" in the shop said no. I had to have my computer on and iTunes on. So I didn't get it.
But I did a bit more reading during the week, and some people on other forums seemed to be suggesting that you could do it. So I took a punt and bought one. Set it up over the weekend, and sure enough, you could do exactly what I wanted. There's an option in the Apple TV specially for setting it up like that. I was quite surprised that the Apple Store people got it wrong.