I've often driven by here, & figured I'd go in & take a look sometime. 
But I was looking for a clock-mini-speaker system that I use with my iPhone 4.  

When I had my 3G, I had a very bad experience where I was assured that a particular clock-mini-speakers I bought would work with it - but all it had was a cheap plastic adapter that the 3G kept falling out of - & then they gave me a hard time about a refund.

This time, I was again getting either glib reassurances & non-specific information, "sorry out of stock"s, or  NO OPEN floor samples I could look at, at 3 other stores (including the big A Store with a lot of Jobs), not to mention conflicting info on Amazon & upon Googling.  

So I thought to go into the iStore. Boy, was I pleasantly surprised! They had open, plugged in items that I could actually test my iPhone 4 in to make sure it worked. Even better, I began chatting with the guys there about various other iPhone &  MacBook Pro issues, & found they had FAR more knowledge about BOTH the phone & it's peripherals and MacBook Pro's (and HONESTY about them) than I ever got from the "really-really-smart" folks at the Big-A-Store-with-Jobs who will promise you anything. 

So, I would definitely go back there for honest advice & I would certainly bring in anything that needed warranty service.  They also have a pretty nice selection of peripherals and better yet, they know WHAT WORKS WITH WHAT!