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This is a great purchase if you are looking at getting into Space Marines in general. It really lays out how a Space Marine is created and traditionally chosen and what they can do. The action scenes are solid and well described for the most part. The characters have personality and the villains are well written. It doesn't reference many events outside of those relevant to the story and when it does they are given context. It is both a good read with a self contained story and an easy way to get into the lore.
One minor word of caution before you get this Omnibus of amazing 40K Space Marine intrigue, this is not new material, it is the same as the Ultramarines Omnibus, just re-named and re-packaged. If you don't already have the Ultramarines Omnibus, get this Uriel Ventris Omnibus...you will really enjoy it.
Overall it was a decent enough read and you get plenty of content for the price you pay. The only drawback is that Ventris and the Ultramarines are a bit short of character, this is made up by having other individuals in the story who can make up the deficit.