I'm not a poster boy for ammoman, but I've spent a few grand with him over the years, mostly for ammo. It was as advertized.
I had a 4 day defensive rifle class at "Front Sight" the beginning of April and I called ammoman to see if he could get a case of ammo sent to the hotel I was staying at in time (in 10 days). He was honest about when it would be shipped and he thought it would make it, but the timing was to close, and we both agreed it would still be "iffy."
I didn't read all the pages posted on the website you posted above, but what was obvious to me was the "SKS problem" was the only gripe I saw. I would think that there would have been more complaints if that was a reoccuring theme for ammoman. But the thread didn't seem to indicate that.
I only use ammoman when I can't find what I'm looking for locally.
I have 40 of the "Center" magazines coming from ammoman, (he cut the number you can order at any one time back to 5, after the first day). I'll post if they are not as advestized, if interested.