Max, how do you term 'long term'?
more than 2yrs.....?
My PM skimmer is still working OK after 3+ yrs, although I broke the neck off during cleaning last year. I have the neck glued back and have no problem so far.
Workmanship is very important as well as finishing on the egdes that is to be bond. Big gaps and the bonded parts will be very weak and can give way after some time.
Handling by the hobbyist is another, if the unit is subjected to knocks everytime it is maintain....it wouldn't last very long