Don't buy the first iteration
I bought the very first iPhone 4, had hardware problems that were well reported.
I bought the very first iPhone 5, had the lock button problem and Apple took a week to fix it.
I'm going to wait a while this time.
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Apple has excellent talent, but quality control issues that have appeared do cause some people to question Apple. I can only guess the decline in quality of the iPhones, MBA's & rMBP's that I've bought each and every year, and is caused by money saving cuts, it does disappoint.
I never had to return a single Apple laptop until the 2012 and 2013 models. With a drop in quality control, it does cause wasted time and money waiting for replacements from Apple. With some luck perhaps Apples accepted responsibility and will deliver the premium quality we pay for.
Their quality control has been crap for a while, IMHO.
How can an Apple phone with Apple's OS not give me the correct album cover artwork in Apple's own music app with music purchased from Apple's music store?!!
And yet, there it is, completely F'ed up album artwork on my iPhone 5.
That's the same iPhone 5 where the lock button broke after a year. I went to Apple and they said it would be $279 to swap it out. I left.
A couple months later, Apple announced that if you have an iPhone with serial #s within a certain range, they would FIX your iPhone over a week.
Ugh.
I have a white Mac Book (plastic) that has bits of plastic broken off of it after normal around-the-house usage (not travel).
And the iPhone 4 and 5 can't make phone calls like the iPhone 3GS! What?
Not to mention the horrible battery life.
Oh, and don't get me started with their Final Cut Pro X. I love that app, but it has been a very painful 2 years. They are STILL updating it with bug fixes, after all these years. You know, like you can't burn a disc bug. Something simple like that.