I have to say i only have one that is not currently working and that was the fault of me sending it to the wrong place.
I have had some problems with a slipping hand on an asian 7750
The 28xx style movememnts be from eta of other factorys are all still working
I have never had a watch fsail to be water resistant to the degree of a shower and i have swam in most, Althought i dont wear chronographs in the shower.
Please bear in mind that i am capable of rectifiying small faults on my watch and a bit of modding, i check my gaskets and make sure my crowns are screwed down.
The faults i have dealt with are
Lume falling out of rolex dials once
Crapped out asian movement in a bell and ross after 18 months (changed for a myota)
Dropped watches and hands coming loose once
and slipping hands on a 7750
Apart from that i have had good luck
The problem is you can never tell, I have taken time to buy what i have reasearched as being reliable complications, I had a porto with seconds @ 6 in my early days and that was fine and i hear still is.