This is like an oil thread on a motorcycle forum. Worse than politics, religion and abortion all rolled into one.
That said, I have 6 Butler Creek steel lips mags and have had one failure to feed among them through close to 1000 rounds. It happened on the first use of the mag, maybe the 6th or 7th round fired. Nothing since. I find them easy to load because the spring design keeps a constant tension on the follower instead of getting harder and harder to load as more rounds are on the stack. The rifle is an older well used 10/22 with a metal trigger guard if that matters to anybody.
The next 5 guys will have had horrible luck with the BC mags and won't use them under any circumstances.... From what I can tell, it is a crap shoot with both the 10/22 and the mags for it. My sample of 1 rifle and 6 mags says all is 100% and trouble free, but many others will disagree on that.
Mark