I'll be making my own soon enough
I'll at least try to make it professional, because the one's I have tried have just been very poorly constructed. No game designer would do it the way the majority have here because game's aren't about insane difficulty, they are about competent difficulty and clever AI. If you like grind fests and typical stat boosts, then you are going to like most difficulty mods round here. I don't. I will look at the one you mentioned also but my own mod will be made mainly for my own tastes.
I will say that it isn't all negative, there have been some good decisions too, like changing puzzles, making the non battle elements more difficult, and adding battles for the Summon Materia (not that I would do the latter). But I am talking mainly about the battle difficulty... which on the whole has been disproportionate and lame.