I have tried this mod for amost 50 hours of gameplay. It is a must have if you want a realistic and challenging game. It makes the combat really deadly (you can kill the majority of the enemies with one shot, but also the enemies can do that) and it adds a lot of details to the world, some big (Like the time game, that has been increased, and the fact that the world will not level with you, the difficult is static) and some small (like when you exit from the house, this one will be locked, and all the animal and monster loot has been modified to be more realistic. you will not find money when you kill an animal, but fur, raw meat and heart, and other organic things).
I have played this mod with a STEP installation, but i had to cut off some mod's (like the werale lanterns one, for scripting problem and the increased greeting distance, because the Requiem mod has already a fix for that) in order to play. I had no CTD (exept for some freezes time to time...) in 50 hous of game, and i'm playing it with almost 100 mods.
P.S. English is not my language, sorry for possible mistakes :P