I'm actually playing through Clear Sky right now. I had no intention of buying CoP, since I paid full price on CS and hadn't really touched it in all this time. But after seeing that they had a benchmark, I wanted to see how it would run on my PC. Watching it run through got me all wanting for that universe again. I tried playing CS previously (I picked it up from steam when it was first available for sale), but having an older PC, combined with the initial beating I took from the AI resulted in the gametime being brief and it ended up being put on the backburner for a good while. CS wasn't as well received as SoC, but so far, I'm enjoying it, even with all its bugs and quirks and it made me look around online for a copy of CoP, to no avail.
When I exited the game today, I noticed my steam icon was flashing and when I clicked on it, wham! there's CoP for sale. Suffice to say, I was happy, especially since I can't seem to find a physical copy of it for sale anywhere in Canada.
The good thing about the deal is that it's indefinite so there's no real rush in having to buy it right away.