Shock troopers have a relatively long attack range compared to other infantry units. It has also a slightly longer sight range.
The shock trooper fires one lightning bolt at a time. The recharge time for the next lightning bolt is relatively long.
The low rate of fire can be compensated by building a large group of shock troopers. Such group can be very powerful and can destroy entire armies. This is sometimes referred to as a "disco dance", due to the large number of lightning bolts being fired.