Do the tips of these tweezers bend out of shape over time?
Many of these tweezers have fine points, so it certainly is possible to bend the tips, but it is also possible with all the tweezers to hold smd parts very firmly without damaging the tips.
Just did a test by putting the ESD-15 tweezers sideways on a scale. Applying a force between the fingers of 1.6kg is fine. I didn't go to the point of damaging the tweezers so that is well below the point at which the tips would bend. With the ESD-13 tweezers, I could comfortably apply 3kg of pressure without the risk if tip deformation. This tip is still thin enough to get into small spaces and the rounded profile makes it handle small objects easily. They work fine if the object is not centred.
There is no sign of scissoring in these tweezers, so when you apply a fair bit of force, there is no twisting evident.
Now I do have other tweezers with stronger tip profiles that are much more likely to last 30 years then the fine tip models, so all I can say is that if these are looked after, they keep working fine. The HRC40 Stainless steel seems to be a good compromise of strength and flexibility. At the price, I can afford to buy spares. The ones I purchased were:
1 x ESD-15 Curved Tip (250G closing force)
1 x ESD-13 Broad Tip (250G closing force)
3 x ESD-14 Fine Tipped Broad body (190g closing force - The fingers are only about 33mm from the tip)
1 x ESD-12 Normal sized Fine Tip (300g closing force - The fingers as 50mm from the tip)
I have only been using them about 4 months and have no damage yet.