EAA's customer service problem was limited to some cracked slides some years back. EAA was a family owned business and, as I understand it, the head of the Customer Service area was a senior family member, who could be difficult (to say the least). That's not to say that there were some cracked frames -- but the slides were a big issue and turned off a lot of buyers (most of whom swore to never buy from EAA again.)
The problem slides were mostly for the 10mm models, but a few .45 a.c.p. guns had issues as well. The head of customer service at the time claimed the problems were due to too-hot, non-factory ammo, and that was NOT the case for many of the owners -- who were shooting factory ammo.
The problem person was eventually moved to a different compnay position a number of years ago, but the memory of the bad customer service due to a slide problem has lingered on. (Tanfoglio redesigned the slide for the large-frame guns, and the problem apparently went away.)
I've not heard of any problems in the last 10 years (+/) and all of my dealings with EAA --(which was been for parts for used guns, not under warranty) has been very good.
If you're buying a Tanfoglio-made gun from EAA, you're very likely to have a gun that doesn't need warranty work, and if it DOES need warranty work, you'll probably be treated well. But as others have said, EAA doesn't make them, and you need to research the gun (and who made it) for your own comfort and protection.)