[Experience with Lead Star 9mm lower]

I have only been running mine for about 6 months now but so far, I have zero complaints 

[Why 40+ round mags?]

I personally run a larger mag in our local carbine matches because the round counts can get upwards of 50 or so per stage. But at USPSA matches, I generally just run a Glock 33 with taran plus 10 and load it to 40. Gives a few extra shots if needed.