partysnackI have 2, both do have much more play in the tip than sliding-sleve style pencils (Rotring Rapid Pro 0.5 and TWSBI Precision 0.5). The amount of play is similar to the amount in the uni-shift 0.5 and TUL 0.5.
Further, it appears that if the top is twisted to force the tip out a bit further, the wobble is eliminated. Examination of the retractable tip shows a slight increase in diameter further back, which I expect is supposed to reduce wobble. Unfortunately the slightly thicker portion is not normally far enough forward.