Hmm, I don't have any serious problems with A-MERC brass.
I've had one that the flash hole was off center enough it wouldn't deprime. Scrap bucket. Just last week I had another one with the entire primer pocket off center, the flash hole was centered in the pocket but the pocket was off center, again, would not deprime, scrap bucket.
I've scrapped more WIN cases than I have A-MERC, however, I have more WIN cases available. Just recently I had a run of *I* .38 spl brass that the primers would not push out, instead the cap broke off leaving the ring of the primer in the pocket, couldn't get them out so I tossed them in the bucket, too.
The only time I sort the A-MERC is after I reload them, I put them back in A-MERC boxes, those boxes are the ones I take to ranges where I know I probably won't be able to recover brass.
CBC is my favorite.
Although I did score a bunch of TZZ MATCH brass from some guys with a Thompson at this one range, and that stuff is nice.