It took me a couple of weeks, but I finally finished it, and I think its by far the best in the trilogy. I somewhat liked the first two novels, but for some reason I really got sucked into Silentenium and got more out of it than the first two books. Still a complicaed read that will take me time to fully digest. Oh, that was my 13th Halo book 
Next up: Halo: Hunters in the Dark!