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Apple store gave me a new iPhone after I had some problems with my previous iPhone

I bought my iPhone on June 29th '07, had some problems with it and Apple local store swapped it with a new phone in the second week of Jul '07. After having it for a while (11 months) the phone started making some mechanical noise while charging. I took it the store, they swapped my phone for a new iPhone (This was in the last week of June).

Do you think they might consider giving me an upgrade if I go back to the store. I do feel guity of thinking about doing this.
 
I would say no. I've had the same issues, even buying it at $600 on release day. I'm on my 3rd iPhone due to problems with them (major ones, not minor ones). I even bought the AppleCare. They said they would not give me a 3G one, and I really wouldn't expect them to. Hopefully this iPhone will be a keeper.
 
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