Xoids make excellent 'bad guys', especially when playing a game with ship combat. They are simple to use, having only one driving motivation - 'conquer'. Xoids have been active in AIF history extensively with the most recent occurrence being the invasion of the Second Galaxy.
Most of the games we have done which involve Xoids, have leaned towards a military operation. Currently in the Second Galaxy there is a stand off between the Xoids and the Reich. The immense combat zone is near the galactic core, and there are battles happening constantly with forces from both sides occasionally breaking through the opposing line. This opens the arena for every kind of combat imaginable - personnel, fighter, walker, cruiser, or larger.
There is no doubt that a Xoid is a tough opponent. Their natural armour and large size make them effective ground combatants, while their ships are usually unsurpassed in ability. They make an excellent challenge to combat oriented characters.