I've had this game since 0.14 from their website and only started using it through steam when 1.0.0 hit and, I've got to say, It is single-handedly the absolute best and most addicting game I have ever played. If your reading this then don't hesitate to grab Factorio: the only regret you'll have is that your enjoying it so much that you're forgetting to sleep in favour of figuring out why all three circuit types are running low. (hint: it's usually either running out of plastic for the reds or the greens can't keep up).

Edit: Spelling/grammar