I have played it for a few years and i like it. It´s easy to learn but hard to master, think totalwar in space (kind of).
You need the expansion thou, otherwise the game is rather dull.
I got the complete pack from GG, it is on a weekend sale right now. £5 for everything SOTS 1+2 :)
Ok, hope you enjoy it, 4 x games are one of my favorite genre and more people need to play them in my opinion.
I have SOTS 1 + all the expansions but never played it, its on my pile of shame. Thats what sales does to me, creates backlog :D