Tula, Herters, Wolf, you name it and I love it. And buy a lot when it's down to 20 cents a round, very competitive with reloads. Of course I buy brass cased ammo too but only a fraction of the cheap stuff. The cheap stuff is good and works well enough. You can fire a couple hundred rounds in a session without cleaning the rifle and without breaking the bank. $40 vs. $70 means something to me.
I don't obsess over 1 MOA, steel case is plenty accurate for training and even for serious use. 3MOA is good enough for the military and good enough for me, using irons and RDS. I keep hearing about crap ammo, dud rounds and how it doesn't function but with minimal mantenance I've had no malfunctions with steel case.
And I'm not alone, there are plenty of people who swear by steel case, so the problems we hear about are NOT ammo related. And the rumours that it hurts your gun are just that - hearsay. Steel case is very soft compared to an AR's chamber and your extractor should not be ripping at the rim during extraction, you should hardly see a mark where the extractor hooked the rim, something's wrong with the rifle if you do.
I know we all have our own opinions but I think it's important that an AR handle the stuff. I'm not a fan of picky guns, I like them to shoot what you might have to settle on someday.
Oh well as usual, YMMV. I'd say buy a little and test how it functions in your gun.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek