I remembered that I read form somewhere that the E.L.F Studio series blending/contour/crease brush can scratch the lid with its ferrule... I looked at mine and thought: how? Apparently E.L.F. has somewhat changed the design of the brush during the last year, mine looks and feels soft and useable but just look at the review a blogger made about her brush haul in October 2009 and this blogger in March 2009. This brush used to be real crappy indeed... It also looks bad on the pics Sirvinya took of her brush haul in September 2009.
I have the impression they modify the brushes all the time, this accounts for the constant rants about the quality not being stable. For instance the Studio powder brush I got some time earlier this year has a shorter and thinner handle then the one I got in a kit later on.Just look at these: the same eyeshadow brushes but one's ferrule is rounder then others and of the slim ones, one has the hair all blotched (hair moved when ferrule was attached and this messed up the shape of the brush):