This is what I wrote about on Radical in the Rifles, Uppers, Lowers, Barrels, and more section back on 15 Aug 14. And as a minor update, I am up to 880 rounds through this upper. 160 of which are Herters/Tula. I know some folks are picky about steel cased ammo, thought I'd share that data point if it's important to anyone.
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I ordered a 7.5" 5.56 upper on 13 Jul and shipped 4 days later. They did charge my CC right away though which contradicted their website back then which said charges upon shipping (it appears to read differently now though). So I called them the day after my order was placed when I saw my CC charged and they told me that's standard. I really didn't mind because the site at the time said that upper is shipping in 2-4 weeks. I got excited like a kid at Christmas thinking my new upper was shipping sooner than expected.
There are 2 things I am not too concerned about but others might be.
1. My Spike's NiB BCG would not fit in the upper, best I can tell is the gas key and tube do not line up well. So I used a BCM phosphated BCG and it fits with no issues.
2. The rails on the bottom section seem out of spec. I tried to use several Magpul XTM rail covers and they don't fit well. The sections will connect but they will not 'click' together. I think the rails are just a touch too wide. Not a huge deal. I did end up having to glue 3 or 4 sections of my Magpul Handstop kit just to keep them from popping loose.
I have close to 800 rounds through this upper now and have no complaints. I used primarily M193 and AE .223. I also tried 40 rounds of Herter's. No issues with any ammo so far. And the barrel is accurate 25 to 50 yards. Not sure what it can do past that.
Anyhow, the 2 items above may be deal breakers for some folks, I get it. Hope other folks out there have positive experiences with the company and their products.