The Klingons from PD are the unrepentant imperialist nod to the old Soviet Union that TOS portrayed. I've picked up the books and they are an interesting read to say the least. Of interest is that they see the Federation as competition, but not enemies as such. But if push come sto shove, they are quicker to pull the trigger than Feddys would be. I'd recommend the books. I'll be curious how they handle the Romulans
A brave little theory, and actually quite coherent for a system of five or seven dimensions -- if only we lived in one.
Academician Prokhor Zakharov, "Now We Are Alone"