This is a great little device whether you're running it on the bench or fitting it in a project box. It is easy to assemble and looks and feels good too. Fitment of the heatsink is recommended. The simple controls and easy to read display indicating input and output voltages as well as current draw are helpful as well.
I ordered two of these and using my benchtop power supply and a volt meter I did find that the output voltage was 0.02 volts lower than what was indicated on the converters display but for the price and the equipment I'm powering off it I am not complaining.
If I were to have issues it would only be that one of the displays I had was scratched by one of the screws during shipping and that having either a display brightness controller or an option to turn the display off would be welcome. Also be careful about how tight the screws are when assembling as the clear plastic protectors can crack in the corners. Theses really are just super minor things that doesn't really take away from the operation of the device.