Upload & Sell: Off
I have two. On one, there is play in at least one of the axes unless you tighten the quick release (turn the quick release to bite harder, anticlockwise, opposite from releasing). After tightening, there is no play.
Once I realised you could do this/have to do this, I can live with it. In fact, I started noticing that this can be required occasionally on other axes on both units. So it seems normal.
Come to think of it, this may even be in the manual -- sorry, can't find mine to check at the moment, and I don't see it online.