A lot of people have touted this stuff as a cheap alternative to prescription adderall, which is largely true if the vendor is honest and actually gets pure stuff. Recently got two batches and while both were primarily amphetamine, they caused weird effects (huge pupils even at small doses, facial nerve issues, paranoia and head pressure). All of these happened at doses of about 20 mg, and I take prescription stuff on occasion at doses up to 60 mg for a night out.
On top of that I tested them with the Marquis, mandelin, mecke and Simon's reagents. Both tested positive for amphetamine with Marquis reagent, though one showed a flash of purple before going red to orange to rusty over about 30 seconds. With the mandelin one tested positive for amphetamine, one showed amphetamine plus some something that turned purple. Mecke for both turned a slight brownish green for both, rather than the non-reaction it should have for amphetamine. There's only a few things that fit all this. Methoxyamphetamines (impurities from a really bad synthesis) or pyravones (mdpv, bath salts, whatever you want to call it.)
I tested these reagents with Tylenol and prescription amphetamines which reacted as expected.
Edit: Lostheaven was the one that had stuff keeping people up all night when dosing in the morning.
Edit 2: I can provide pictures of reagent tests if someone refers me to a good anonymous (pref .onion) image hosting site
Name and shame