I've been using the IMI Systems ammo for over a year now at 100 and 200 yards in the CZ pistols with good results. Videos in Day at the Range section.
After yesterday's 200 yard session, which I almost didn't attempt due to not having any Atlanta Arms 115 gr JHP Match ammo in hand, I can say that the IMI is as good as the AA. If there is any difference, it wasn't discernible based on the limited shooter skill anyway. After one shoots a few 8" groups at 200 yards, one isn't likely to say, "Well those could have been 4" if I had better ammo." I know better. I know when the dot isn't perfectly positioned and I let the shot go anyway--it isn't bad ammo. I also know that it takes good ammo to shoot consistently good groups day after day and that is what I've seen with the IMI.
There is probably lots of good box ammo out there but I'm not experimenting a box at a time. I have shot nearly 2000 rounds of this IMI ammo with excellent results, for what it's worth.
Joe