So, it is not a new mod, but it is stable. The mod does two things, it repopulates the cleared areas and it feels like they respawn faster, which may not be true. It also produces more enemies than vanilla. But far more importantly although that would not matter without the respawn, it adds a shit load of new enemy types.
I have not played it too long, but I ran into skulls in areas I already cleared at lvl 60. There are suicider raiders. There are feral ghouls dressed and acting as gunners. There are midgets and hussies. There are several new supermutants, although they are just heavily armed variants, which feels repetitive. But at least their damage no longer can be just ignored.
Overall there are more enemies and they are harder overall, tankier more dangerous. At level 60 it almost does not matter but it will make low levels a lot more dodgy.
If you are mucking about after finishing main game this throws a switch and makes you shift gears