I have at least a dozen mags with the Check-Mate follower. As mentioned above, it's necessary in a +1 capacity mag, but if you don't want or need the extra round, it has no advantage over a G.I. follower.
I've never really had any performance issues. I did have a problem with lock-back, years ago, but it was addressed by tightening the tube specs, and no issues since.
"A grip safety is just another excess moving part. I have never known one to prevent an accident, and moreover, it is difficult to postulate a circumstance in which it might." Jeff Cooper
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