I have 2 seven rounders with the rounded follower. I think they are some of the best even though JB didn't design the rounded follower.
Of course I have other mags but in my pistols which include a Springfield FS and Colt LW Commander, both .45, the Metalforms with the rounded follower work great.
I also sorted out my 1911 mags with the straight, GI type feed lips which also perform best in my pistols. I prefer 7 round mags.