The only one I've received a free sample from was MBV, and those sampled stunk. Freckled Lemonade is vapable, but not something I'd put in a tank, maybe an EVOD for an afternoon. But the gesture is appreciated.
Having said that, Just received my first order from Moon Mountain, and Krystal included a largely written note on the invoice, with cute little stars pecked about it. She just wanted me to know that Dusty Boots was her ADV and that she'd hoped I'd like it as much as she did.
No sample, but a nice sticker for my vape box.

So far I can tell their juice is made from quality components and vape smoothly, though I'm sure they'll get better with time. They're not chemically or medicinal.
I can tell you, I'll remember the note, her name, and the juice.