are MMATS wavedrive subs any good?

I have like 7 MMATS wavedrive 10" subs that were given to me by a friend who bought them and didn't use them. They are in great shape, just a little dusty. I did a little research on them and everyone says that MMATS is a really good high quality brand. But everyone that says they've run them has had 15" subs. Has anybody used these subs??? are they any good???