I've owned a couple of GHK AKs, including the AKS74U.
Real AKs do not have a bolt catch like AR15s, so GHK does not have this feature either. However, all second gen GHK AK (2008+) have the stop fire feature, meaning it will not fire after the magazine is empty, but the bolt will stay forward. Look up some videos of the GHK shooting and you'll see that the gun stops firing after the last round.
As others have already mentioned, the GHK AK has half bolt travel. However it still has good recoil and retains an excellent rate of fire.
In terms of reliability, the GHK AK is good to go out of the box. Personally I've only had an issue with the feed lip on the magazine being too tight which caused misfeeds, but all I had to do is file down the feed lips a bit.
I've never owned a WE AK, but from what I've heard from people who have owned both is that the GHK is still the preferred option.
I can't speak much for the KWA/KSC, but it does seem that it is not widely used as the GHK and WE AKs.
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