I have to admit I was hoping to see Commissar Cain as an NPC along with his Valhallan comrades...
That aside, this is a great set of rules...one that brings the Imperial Guard to life. The rules are easy to read, although I would have liked to see character creation presented earlier in the process. Breaking it up the way it is, while making some sense, might be confusing for those new to RPGs in general. The regiment choices are interesting, and provide a fair amount of variety when it comes to designing adventures. The Comrade system is also slightly unclear, especially since the rules governing them are split into a number of different locations (Character Creation and Combat). It might be better to deal with them in Combat, since that's where the bulk of their rules are located.
[4 of 5 Stars!]