Excerpt: After performing well about a year (over the warranty period) my Xperia z has developped a large number of problems. Responsiveness has fallen from the roof. On touching the screen, it takes up to 3 or 4 seconds for the phone to react, as if periodically frozen. Same goes for the camera, don't expect to take a picture in less than 20 secondes.
Cons: Response time, Connectivity, Speakers, Battery
Summary: The phone itself was great, but did not work with T-Mobile. It only connected to 2G and there was nothing T-Mobile could do to make it connect to 4G/ LTE. Make sure the LTE bands of your carrier are compatible with this phone. Seller would deduct 20-50% for restocking fee if I returned it.
Summary: My advice is to read CNET customer review and consumer reports customer review of actually users of whatever phone you use, before you buy. Pay cash and don't get locked into a contract where you have to pay even more.
Pros: slim-easily fits in the pocket
Cons: finding accessories, internal memory, customer service