I've put about 200 rounds of it through my Mini-14 and have only had magazine related problems (had same problems with brass cased ammo of known quality, only with certain mags, though). Not a difinitive number, but I'm looking at picking up a case or half case at a show in the near future to get a real feel for it.
It is dirty and it does stink, but it's no dirtier or stinkier than Winchester White Box that comes in the 40 round value packs, IMO.
I should note, too, that the ammo I have fired has all been 2003 production and has had the red sealant removed. Wolf reported that the red sealant was causing a problem with .223 chambered rifles and a few 5.56 chambered rifles and ceased using it.