If you want to start in first gear for a number of intersections moving the lever down each time gets old quite quickly. For the cost of the first gear start kit it is well worth getting.
I have wired mine into the E/S switch that my Euro has on the shifter console. The trans defaults to S when the switch is unplugged so I rewired it to operate the first gear start option.
The first gear start kit also has a number of options such as a selectable speed for the up/downshift points, central lock activation at a certain speed, summer/winter option which makes the kit quite versatile.