I still don't have any experience shooting the factory Aguilla .223, but I have picked up a few dozen of the cases at our range. I haven't actually loaded or shot any of them yet, but this thread made me curious, so I went out to the shack to resize and decap a few. They appear to be uniform, well made cases. They have a good thick web, the neck thickness was uniform on the couple that I checked and all flashholes were well centered and large enough that they didn't cause any issues with depriming.
I can't speak for the ammo, but the brass looks promising.
I'll definitely load 'em up if I ever collect enough to make it worthwhile.