Just read this for the first time today. Really enjoyed it!
The twist of Meduson and his guys not being what they seemed may have been fairly obvious but it might be unfair to write off the story because of that; there was a bit more going on that just Meduson being XX Legion and using that to try to kill the protagonists. They were trying to track down the loyalist AL and for me the real twist was Thoic suddenly attacking his own legion (fake Alpharius) and it transpiring that the Iron Hands' plan to destroy the Alpha Legion tragically turned into the Iron Hands killing a load of loyal Alpha Legion, orchestrated by the real Alpharius ('Meduson')
In any case, I thought the writing was good and even though I suspected Meduson and his boys weren't really X Legion the build up was engaging. It's fun seeing the good guys working it out along the way- remember the Iron Hands, Raven Guard and Salamander haven't read Deliverance Lost.
The whole thing with the remote controlled ship was cool.
I'd love someone to explain the dead body turning out to be X legion though. WTF? Was that a mistake by the author? That body was recovered from a loyalist AL ship, wasn't it? So it's possible that the loyalist Alpha Legion ship could have one or two Iron Hands guys with them (they're both on the Imperial side after all) but... why would the dead guy be wearing AL armour?