Two of Öfflungswerkzeuge have battery changeovers a Nexus 5 not survived (battery was pretty firmly glued), but at least the phone has survived the repair without prejudice. Better so than the other way.
The Spudger makes a massive impression and the Opening Picks (6 pieces included) have ever taken no harm.
The rest of the sets I need not really (maybe later) and I have to buy more Öfflungswerkzeuge (there's therefore determined individually as a kind of planned victims), the acquisition has still been worthwhile for me because my phone now works again.