Have successfully made a few batches of Greek yoghurt and it has come out very well. It does take quite a while though, particularly as I let it drain for longer than suggested to make it even thicker.
One or two minor points:- it would be helpful if the two containers were of different colours to help easily identify which is which. Diagram 3 on making Greek yoghurt on the instruction manual is misleading since the yoghurt is collected in the strainer and not the container.