... Glued partially inclined together, partly you have small distances between the materials.
... Pretty much offset holes, ie drill itself or man can not turn around a bit.
... If you have something like rust on the Matallkörbchen.
... The weld is not very clean, but I had no tips.
... Are the side panels of different heights (not much, but when it falls on screwing together).
With a shelf I have almost a splinter pulled (at a crossbar), but otherwise the material was nice and smooth.
Were they once assembled they look very great and are good.
I have none of my two shelves mounted on the wall, so can not say anything.