just don't come to sayter if you have a RPG growth related bug while using FU and you'll be fine.
also read the bugs threads, there's at least a class weapon that bugs out at tier 1 due to changed weapon scripts.


Also if you don't want the game to be too easy peasy, I advise on a difficulty mod on top: your choice though.

I answered in the comments section as well:

@Procedurally Generated Birb - Due to the popularity of FU, we will continue to look into any issues that arise between RPG Growth and FU (and for that matter almost every mod, really). Please note that compatability is not the same as complete integration: FU was large enough that we decided to add XP to the new monsters it adds, but other mods that may not be as large or popular may not get that leisure.

Also remember that if it is possible to fix, but is not our mods fault, we may take a lot longer to create a workaround, if at all.