I have had my phone for over 2 years and I am overall happy with it.
I have updated 3 friends phones, none of us have ever had to call or bring in the phone for any replacement or anything.
My friend with the most amount of problems, his problem is himself.
He loads way too many games and junk on his phone.
I have 1 or 2 crappy games and strictly use my phone for web, camera and texting and making phone calls.
I will probably never buy a Sony phone again due to their lack of support and updates....but nothing to do with the hardware itself.