I've come accross a site selling 20 ml sachets and want to get some. The name is very similar to the sachets everyone has been raving about but seems to be advanced. Is this legit or should I go with the 5ml less advanced stuff. If the 20 ml is good to go I want it. Seems to be cost effective. Are they both good to go? Sorry for talking in code. I don't want to break any rules.