For the last 20 years I've always had another stick of the same model as a backup. Pretty normal, I know. But, in every single case, I can not only tell a difference in the two, but will always prefer one to the other. My most recent example (Volkl DNX 10 Mid) is extreme enough that I'm halfway considering dumping the newest one and ordering another. Is this normal? Should I seek physchiatric help?