Latisse has been extensively tested and is approved as safe and effective by the FDA. SmartLash did not get reviewed and tested by the FDA and is sold over the counter where it can make ALMOST any claim it wants to.
Latisse has a scientifically proven hair growing ingredient while SmartLash contains " Marsupium Bark extract, Apigenin, Panthenol, Mannitol, Lecithin and soybean oil" . The Pterocarpus marsupium, or the Indian Kino Tree has been used in Indian medicine as an astrigent and treat inflammation and Diabetes. Panthenol an alcohol version of Vit B5 is used as a hair lubricant and conditioner. NEITHER of them has been shown to GROW hair.
As for the reviews, look at politics and opinion polls. Don't you ever wonder how misguided some of your fellow Americans really can be? Everyone has an enthusiastic opinion on everything. But that does not make it valid.
I would go with science rather than voodoo any day.