Finished it. Reviewed it here. To sum up my thoughts...
BEST. 40K. BOOK. YET!
I'll post some more spoilery thoughts here later, after I have something to eat. I will say this, Void Stalker
still remains my favourite book due to it's subject matter, but I acknowledge that The Talon of Horus
is better. And if the hints of what is to come in the next book are true, I think that Book II The Black Legion
might surpass Void Stalker
as my favourite book period.