I'll be completely honest, I wish I'd gone into this knowing a little more. Having no idea where the story was heading discouraged me during the longer, more boring parts. There were a few of the books throughout that just bored me half to death, only to be useful and come back and make sense at the end, in Pandemonium.
All in all, it was a great delve into the Sith and the Old Republic Legends-verse.
I liked how it spanned over two thousand years, and we got a good look at how a civilization can set itself up, tear itself apart, and then build itself back up. The ending quite surprised me, sticking to that odd little reminder at the back of my head that the Sith aren't the good guys, and that they might be kind now, but are deceiving by nature.