Nice products
I have had a few Sony Xperia Z series phones in the family and they have always survived remarkably well. A durable case has resulted in teenagers not damaging a Z5 and Z5 Compact for years. My own Xperia has been dropped and dunked and I have always been surprised that there is no damage.
Screens are excellent as is the battery life. I am sure there are many who have equally bad experiences but that is generally true of most things.