The foil ball worked great–no static whatsoever! I only used one, and I’ve read they can be used over and over again, but I suppose if you have a really big load, you might want to use two foil balls. It gets all smooth and a bit more compact from bouncing around in the dryer, so I know it won’t snag the clothes or anything like that.
I use vinegar in the washer rinse cycle, but it did nothing to reduce static. I pinned the blog article I found about making the foil balls here on my Pinterest board.