Metalform are okay for general use. They work, but they are not the greatest.
I really like Wilson 47D mags, but I keep them full of JHP, and dont use them for range blasting. They are also a little expensive.
Mec-gar 7rd mags are sweet! I really like to use them at the range as they are very easy to load, they insert into the pistol smoothly, and feed rounds easily. They are all around slick magazines
. Sometimes you will get a bad one that wont feed right, but you will know if it is bad the first time to the range. Otherwise, they are very reliable and function great.
Stay away from the crappy no-name 7rd mags that go for about $5-7 at gunshows and on the .net. You can get some that work... for a while
. The follower tab gets chewed up by the slide stop and before long the floorplate will break its crappy spotwelds and the spring, follower and several rounds of .45acp will shoot out the bottom and end up all over the shooting bench
.