Share your experience!
Just being totally honest and straight forward...
Just buy a chap soft gel case from Amazon.
http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=xperia+z3+soft+gel
It isn't Sony's responsibility on how you handle your phone.
The same goes for when you buy a new car, the manufacturer or dealership isn't going to cover neglect or misuse... how you handle your phone is up to you. If you don't protect it and it gets damaged, if it is covered under warranty, great, if not, sorry.
The options are
1.to buy a good looking expensive phone and quickly cover it with ugly robber/silicone case for extra money
2.to buy Samsung S5 Active
I had a problems also on some surfaces, try these guys on ebay, great cases and made to order..
When I first took the film off the back of the Z3 I was amazed at how frictionless it was. I mentioned to a colleague that I would have to be really careful holding it because it could slip through you fingers. I never thought it would just slide off a desk without the phone ringing or vibrating.
My copper Z3 phone slid off a desk onto a tiled floor and broke the day after I bought it.
As well as the cracked glass, the phone doesn't work so it is back with Sony for repair at my expense.
This is a product which, when used in the normal way, breaks.
Had the Z3 just over a month and noticed it managing to slip off every surface known to man (normally just onto a soft carpet). Now it's slipped right out of my hands onto the pavement and smashed, and O2 want £250 to repair it. Not a happy bunny.