It is the most controversial part, but also the one that gave the stalker a lot of good opportunities.
-Repair and Upgrade of Equipment
-Attitude of Groups to the player (and not stupid reputation level as in PM)
-New system of artifacts and addition of detectors
Although there are quite a lot of minuses, it will take a long time to list, but everyone mostly complains about bugs (by the way, quite a few remain unresolved even from the latest off-version) and the gang war that turned the stalker into, roughly speaking, a shooting gallery (although, in my opinion, this is not bad since you need to introduce something new, otherwise if this was a copy of PM the players would hardly be happy)