So, here's how it is...
(Sorry. I could never resist a gratuitous "Firefly" reference)
I'd received my sample four boxes of Magtech 9mm 124-gr FMC, but didn't get the chance to take it to the range till today. First impressions were that it was very shiny, and seemingly well-machined. Good packaging and overall impression of good quality control.
So much for aesthetics. I shot 200 rounds today, and the accuracy was quite good, controlling for the fact that I was a bit out of practice, and had had my sights trued since the last time I'd shot (I think the previous owner was left-eyed, or had corrected for windage then forgot to re-zero the sights), so the learning curve re-steepened for a few mags (five rounds each, to counter fatigue). Groups then got nice and tight, though.
In the 200 rounds, I had just one FTE. So bad, I had to field-strip the weapon and pry the spent round out of the chamber. Subsequent inspection of the casing, though, showed what appeared to be a deformation (visibly oblong in cross-section), so it was likely just a flukey round, since all others ejected just fine.
After my session, I took the gun down (I had cleaned it even more obsessively than usual the last time out, to give myself a good baseline). Found the innards to be cleaner than they had been with the Federal American Eagle, but a little more dirty than with the "Zero"s (reloads by which the owner of my range swears). Well within aceptable parameters for practice ammo, and no unusual cleaning requirements. Just a little toothbrush/bore brush/Q-tip/Break Free action, as usual, and no excessive effort required anywhere. Also, I quite liked that I could find NO brass shavings anywhere, as I had with the Federal (is this a manufacturing issue?).
Overall, I was quite happy with the experience. That one bad round did get my attention, and I'll be alert for any repeats of this in the next two boxes I shoot (I'll post on this when it happens, though it doesn't look good for this week :-( ). Not bad for a savings (shipping included) of $.50 per box over range ammo (more if I order by the case).