Technically all backlit caps with the exception of DS are defective...
Because there is only a thin layer of paint on there.
EVEN if the edges of the letters hold...
the CORNERS will NOT be visibly sharp, because it is worn from multiple angles, therefore subjected to 2-3 times more wear..
So for example, if they rate the paint for a certain number of keypresses... the inner and outer corners of of the lettering on the letters will only be good for 1/3 to 1/2 of that time, IF NOT LESS.