Ok, I've pressed on with this.
The Exiles' technology is incredibly powerful, they have been evolving their war machines and weaponry while the Imperium are still mired in centuries old technology. They also have advanced force field technology which - in the case of their own troops - provides an intaginible shield which has an equal chance of protecting the wearer no matter what the power of the weapon is that is striking it. Their vehicles are protected by what most believed to be Tau Deflector Shields. In fact, this was a technology that The Exiles devised and passed on to the Tau in their dealings with them.
The Exiles don't like to get personally involved in battles - only the most adventurous sign up to lead their forces into battle, that and some reluctant Medics and Technicians.
As mentioned above, their forces largely consist of clones - known as Servus - which have been bio-engineered to be highly efficient in the art of warfare. Because of The Exiles' confidence/over-reliance in their own technology, Servus are psycho-programmed to specialise in the art of ranged warfare, and as a consequence are relatively weak in the art of Close Combat. On the other hand, they are conditioned not to care about the lives of other Servus which makes them very hard to break.
Their infantry breaks down as follows:-
Exile Leader with Servus bodyguards
Exile Technician (Tech-Marine)
Exile Biotechnician (Medic)
Servus:
Cobra Troops (Devastators)
Smart Troops (Terminator style weaponry)
Blaster Troops (Tactical)
Camo Troops (Assault)
Snipers
Gunslingers (HQ style weaponry)
Net Epic rules for infantry can be found here:
viewtopic.php?f=146&t=26814
. They just couldnt build the old stuff.