Vinny Maurowrote a review of Stan's NoTubes Tire Sealant on January 26, 2016
Familiarity: I've put it through the wringer
Tubeless wheels and standard now and everyone is running them with sealant and having the best time ever. There's some competition in the sealant market now, but I will always stick with Stan's because they were the guys/gals who started it all. I have no idea if they invented it, but they were the ones who put their faith in it and brought it to us to enjoy. And best of all, their product just plain works. I've been using it for 4 years straight now with an absurdly small amount of flats. I literally had zero flats for the 2015 season, which I am almost too scared to type of of superstition, but it's that good.
And to top it off, the price is absurdly reasonable compared to pretty much all other bike specific products.