I dont think sony has worked well with the waterproofing of xperia z3. The speaker wont work for like half an hour after the handset has been in water. Touch callibration disturbes while using in water. Secondly there are the issues of wifi connectivity all the time. Wifi range is restricted in all sony z series. I have been using sony since 2-3 years ( coz I was its fan ) (was) and I dont think buying a sony handset especially xepria z3 is worth spending money.