I've ordered a few times from them. It's very hit-or-miss for me so far; I vaped something I ordered called Turkish Delight down to the last drop, standing the bottle on its cap to get it. On the other extreme, both incarnations of an Atomic Fireball knockoff weren't even close (Atomic Cinnacide has nothing to worry about).
Keep in mind that the very long list of flavors contains potions that customers have cooked up on their own using the Flavor Creator; those people aren't necessarily mixologists, and may-or-may-not have known what they were doing. Example: somebody around here (who shall remain nameless, but is commonly referred to as "PI"), came up with something called Cinnamenth. I wouldn't recommend Cinnamenth with extreme prejudice.