Z3Compact experience
Got this for the lady of the house. She's quite pleased with it. Though, she did experience a cracked back within a month of ownership. There was no obvious damage because, well, there was no damage. Just a nice long crack on the back glass plate. Made the inevitable call to Sony Xperia support. They sent a shipping label and packed it off to a local depot for repair. Was turned around in one day, back plate replaced at no cost. There is some noise on the internet about the back plate fragility, and it appears in my experience to be a possible flaw. But, the service for replacement was seamless, effortless and incredibly fast.
Just my two cents.