My only complaint with the Vizatek MPS-3003LK-2 is this: there's a button to toggle the power to the variable output on and off. There's a corresponding LED that indicates when the load is "on". When you switch the load off, the voltage and current displays go to zero. This makes sense, it reflects that the output is off.. but it would be nice if the voltage display showed the present voltage setting even when the load is off. That way, you could dial up the voltage you want BEFORE appying power to the load. After all, there IS a separate LED indicator for the load.
As it stands, when working on a new circuit I usually disconnect any circuit from the Vizatek, turn the 'load' switch on, dial up the voltage I want, turn the load switch 'off', connect my circuit, then turn the load switch 'on' again.
The unit DOES retain the last voltage setting, so you can turn it off and back on knowing that the same voltage will be selected.