My Acro S has been good to me for 2 years now. I love everything about it. Still looks good now with minor scratches and some of the silver thingies scraped off, a bit. Waterproof has also been great. Never had a problem with it and has NEVER been sent to repairs in ages (no screen protector and case for sometime now too, well I'm not very much of a klutz anyways). Fingers crossed, I'd go and rely on Sony's hardware any day!
I'm eyeing for an upgrade soon. Z2 is too big for me. I'm tempted on the Z1 Compact though. Perfect size for me, high-end specs (of this time), probably has a good battery life with that 720p screen (instead of 1080p, good enough on a 4.3 inch anyways), waterproofing and hopefully a good camera. And dat pink doe! Price is already pretty cheap now and will go down further when the Z3 comes out soon. Hopefully my next phone will last the same amount of years.