I had never heard of them until recently. They're one of the newer products that has flooded the market recently (definition= buy at your own risk). The best thing for you to do is search the forums and look for honest opinions on various products. Having one or two people respond here and tell you what to use isn't a definitive method of determining what's best. Look through the forums for "synthetic urine", get a few name brands and then search through the forum again looking for feedback on those particular products. If your UA is observed there is a limited number of options available but if it's unobserved then you have far more options available.
Awayler Reviewed by Awayler on . Synthetix5 Bought some Clean Stream opened it up and it is all cloudy!! Used a product called Synthetix5 instead and passed with flying colors! Sweet! Rating: 5