Prey is worth every cent of even its full price. For $15.99 you get the DLC as well which is apparently good. I haven't played it.
A great game for an extraordinarily cheap price. If you like System Shock/Deus Ex/Dishonoured you'll f*****g love Prey.
Yeah I picked it up. I remember playing the original one vaguely and I was happy to see this going for a cheap price. Just got to install it.