I'm having some pops but since I'm so new to 5x5 I dont quite yet know if its because of my crappy turning or the mod. I'm very used to 45 degree cuts on a 3x3 and 34 degree cuts on a 4x4. On a 5x5 an equal cut (1 cubie / 1 cubie and a half) would be 27 degrees only when I'm used to being able to cut "more".
I sometimes (pretty rare, I'm turning fairly slow to be sure) get a corner piece pop and sometimes an edge piece pops out right with it. I dont know if this counts as stable and I have to chill out or work on accuracy. I dont know if it's an overmod. The corner pieces look fine to me.
The only things I know I did wrong (if you think of Florians original mod to be perfect) is that I did not round all the edges of the center corner pieces. I just rounded the stalk to make it round and to form the hole. I also modded one single edge piece way too much (got a hole to show in the plastic), but the pops have never happened next to this piece so I doubt it's affecting performance.