Due to its large size and armament only very few were completed and given to high ranking officers selected by non other then Emperor Palpatine himself, making it a extreme honor to receive one.
It required a big 28 Engines to reach reasonable speeds however was often seen with only few active staying in a position or very slowly moving. The Annihilator Class Super Star Destroyer with a length of around 28,500 metres (28.5km in short) was one of the largest warships ever created dwafing that of even a Executor Super Star Destroyer.
