Did anybody ever try it and/or in the best case could compare to other results?
It is rather expensive and shipping something that has "COCAINE" written all over it literally - even while not illegal - is something I would rather avoid if the product is shit.
A while back these were used widely as test for quality but when EC (Energy Control) came into the picture they showed EZ test kits are prone to give false-positive results. So ez-test results are not worth anything. Dont bother with them.
You can get you coke tested for free at WEDINOS.ORG to see if it is pure or not. Takes about a week.