I have many Maces.
My 175g purple Recycled Feldberg Maces are very overstable. They are as overstable as my Pains. They are domey.
My 178g milky white Opto Maces are overstable, but not as much as the Recycled ones. They are almost as stable as my Verdicts except that they fly in more of a "C" shape rather than straight with a big fade at the end. They have are a bit domey.
My 171g minty white Opto Maces are stable-overstable, but not as much as the 178g ones. Feel great in the hand and fly great. They are flat.
My 171g red Zero Hard Maces are stable. My beat ones fly stable-understable. Fresh ones fly straight with a hint of fade at the end. I love them. These are flat.
Hope that helps!