Two things here. First, these reportedly have "match chambers" that are tighter than USGI. Based on alot of AR experience, I can tell you that if this is what they've done, these are only plinkers. I don't know if you plan to use one of these for defensive purposes. A lot of people dump on them in that role, but the USA issued 6+ million of 'em for that basic purpose. Reliable feeding under a variety of conditions is not a feature of nice, tight chambers.
Second, although I don't know about IAI carbines specifically, almost all non-USGI carbines are not made to USGI specs, either dimensionally and/or in materials. The price of nice USGI carbines has gone up, but IMO you are still well ahead buying one of them. They won't look "new" -- but if you buy carefully, they will function as well as a new commercial one, and probably better. And accuracy? We were shooting one a few weeks ago with trashy yellow-box UMC ammo and getting <2" groups with the iron sights at 50 yds. (I don't recall -- was the Dope Bag test done with iron sights?)