Top critical review
Top adjustment knob slight movement. Works fine.
on 24 August 2015
Have replaced one item, and the second still has a loose feeling upper adjustment knob. Does not affect the movement/useage, seems like a bad design.
The overall construction is good, it''s' just the knob on the top slider, has a slight up//down movement. I returned the first item and asked for replacement but it's still present. Other users have also reported this when I asked. This is the main reason for 3/5 rating.
For macro stacking the device moves in fairly good increments. I would recommend making a bigger grip for the top adjustment knob, to be able to fine tune the stepping. As it is it would be hard to make ultra fine adjustments (but those device are probably cost three digits).