I'll reiterate this again, cause I know i saw the tests somewhere.
That some(don't know which) icn's were quite underdosed. Searching should be able to find it, i think i've even seen some reports of that in other forums here. But then also is the fact that most(all that i've heard of at least) amps are quite overfilled, which may make up for the total potency of the amp, so that 1.3ml still has 250mg.
I'd say more dirty things about them from all i've heard but I know a lot of guys around here love them(overfilling seems to be a key to that also..) and that I haven't used them but I wonder why i wouldn't use them

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But look around here and possibly other sites to see some of the test results, i'm gonna have to find them soon to keep on hand