the 'extreme' test kit comes with
marquis - which is detailed above,
simon's - which indicates the presence of a secondary amine. (MDMA,MDEA,Meth).
robadope - which indicates the presence of a primary amine. (MDA, dex-Amphetamine, PMA, 2C-B, DOB or waste product from the production process.)
The point is, if you get a colour change for both simons AND robadope, there is a mixture in your pill of substance(s) with primary amines and substance(s) with secondary amines. This is bad, because you could have a pill with a MDMA/PMA mix.
One important thing to note is that (from anecdotal evidence) robadope doesn't work very well if you use just a scraping and you may not see a colour change EVEN IF there is a substance with a primary amine in the pill. The instructions say to use 1/8th of a pill, but i doubt many people do that.
Edit: The Xtreme kit costs 66AUD from
www.EZTest.com. Pillreports used to sell them cheaper, but i can't find the link anymore.