Hi abelro,
I had a chance to get S.T.A.L.K.E.R.:LA about in the same time I got DR. I just played the few first minutes, I've got a lot to do now.

Well, I did not played enough to experience crashes or bug, but if the XR Engine is an improvement of the one used for Call Of Prypiat, it should not be as prompt to crash as the engine of Shadow Of Chernobyl. Maybe scripts for quests are ... playing will tell ...
This is time consuming, but not lost ! These few minutes of game were a beautiful rediscovery of Shadow Of Chernobyl.
I apologize if my english is not well, I am not a native speaker.
Regards.