Checkmate are also good. The current EB mags are made by Checkmate (as are Sig). You have to buy a really cheap no name 1911 mag to get one that is bad, from my experience. And even most of those work fine.
I have heard of the Checkmate brand, but I have never owned any personally that I know of, so I didn't mention them. But thanks for adding them to the list I made.