I was reading the ammo reviews on Midway's website on the Wolf ammo, I also bought several boxes of it a few days ago and have been shooting it for many years in .223. There are some limits on how you use this stuff if you have an AR-15...keep your rate of fire down as it can stick in the chamber, I would not use it for combat, the primers can be hard, the polyurethane coating can get into other areas of the gun, and if you use Wolf after market springs this can make the rifle moody about reliability of the ammo.
Each AR-15 can vary on how this ammo works, some AR's shoot very well with it, others, lots of problems. Try a box or two on your gun before buying a case. It is underpowered, and it is better now than it was 5 years ago. The reason I keep buying this stuff, is that it is cheap, I don't have to worry about brass, and I clean my rifles within 24 hours, so the sooty powder does not bother me. My Mini-14 likes it, my CZ 527 bolt gun will shoot it fine, but the accuracy is so-so.
I started researching it as I see alot of guys at the range with A4's shooting tons of this Wolf ammo, and their accuracy is ok, no complaints about reliability either, or any that I heard. At the end of the afternoon there is lots of these spent cartridges on the ground, so it works for some people.