Buy them just go and spend you money now!
- the stalker series is one of those classic games you'll keep coming back too ,(except possiblly clear sky i didn't rally like it as much as SOC or COP),I've had SOC on my machine since it was released and that 2 new systems and numerous reinstalls.
The thing that really makes the series different is it's not a western shooter ,it's eastern euro Ukrainian/Russian so you get a completely different vibe in the game than your used to in most shooters.The Zone itself is a truly creepy place the feeling of abandonment and desolation really comes through.