I realise I'll probably get accused of trolling now but I love Apple products and use nothing else (apart from a Nexus 7) but increasingly if I buy at launch, I experience dust and/or yellowing problems. iPad Air was especially bad.
I'm sure part of this is because I look for them now - but it really hacks me off. I could call Apple and get a replacement but you then get into the cycle where you receive the replacement and it's gone past 14 days and you can't return it and have to start wrestling with the Genius Bar.
And for £619 I'm not prepared to put up with the hassle. I'll try again in a month or so and see what happens.
To be honest, while I know that each generation phone is more technologically advanced than the previous, I think since the spectacular 4 format, each generation becomes just a little bit more cheaply made.
On the 6, I'm not sure about the curved glass edges - seem very vulnerable to me.
And for the punchline - I have purchased Nexus, Galaxy, HTC phones many times over the past few years (and sold them because I can't live with Android) - but never once had any screen issues of any kind.