I've wondered if MF is worth the seemingly higher prices. Sounds like they might be, considering the small percentage required.
I was surprised to see FLV rich cinnamon at $12.50 for 15 ml. Though again, if you only need mere drops, I'm gonna have to say it's worth it.
And also, about MF... I wouldn't recommend MF to everyone, because not only are the flavors difficult to work with the company itself is a PITA, and despite having at least had a relationship with a juice company in the past (does Virgin Vapors still use their stuff?) they don't seem to want people to vape their flavors.
Ecigexpress did have an arrangement to sell their stuff under the name Lotus, but that ended quite a while back and ecx is just selling off the remaining stock at this point, I think (so what they have left is the Lotus flavors no one really wants. Just took a look and they do still have some Cantaloupe though...) I'm not privy to the details, but my suspicion is that MF as a company is as hard to work with as their flavors are.
That said, if you're an experienced mixer, you're looking for something new, and you're willing to put up with some frustration I would recommend experimenting with MF because... their best flavors are, IMHO, qualitatively different from the rest of what's on the market.
Don't mistake me for someone who thinks that the word "natural" is some sort of magic talisman- many things are better when artificial, as far as I'm concerned. But when it comes to certain flavors... well, the expert flavorists at the flavoring companies work very hard to put 10 different molecules together in just the right proportions to emulate a honeydew melon, and it's amazing how good a job they do of it (especially when you start looking at, say, TFA's spec sheets and realize that the difference between a Pear, an Apple, and a Banana is more about the proportions and the subtle accents than about the main molecules involved. The flavorists are truly wizards.)
But there's a reason the flavorists are trying to emulate a melon. The plant that produces honeydews has had a very long time to experiment (if you'll forgive me for a bit of anthropomorphizing,) and we have spent quite a while breeding it further. It is not limited to 10 or so molecules. It has in fact done a very good job of figuring out how to make honeydew melons that taste like honeydew melons and I'm inclined to think it is as good at that as is possible.
The reason I brought MF up is that FLV's Wild Melons is the best artificial melon I've had, at least if you're looking for something like a real melon rather than something like a melon candy (artificial is certainly better if you are looking for a Jolly Rancher- Jolly Ranchers don't grow on trees. They grow on convenience store shelves.) It's an amazingly true flavor. But MF's honeydew is truer, because instead of using flavorists to emulate a melon they have taken the shortcut of just extracting the molecules from the melon in the proportions they occur in in the melon (modulo possible differences in how effectively they are extracted, but I don't imagine that there's a lot of difference there.) No wizardry required- just a lot of melons and the equipment necessary to do Co2 extraction.
MF's honeydew is probably the "truest" flavor I've vaped, and when done right my favorite standalone flavor. It's round and lush in a way a flavor can only be if it not only gets the 10 main molecules right, but probably dozens more in very small quantities but just the right proportions. I came across it several years ago when I splurged and bought a bottle of Virgin Vapors "Celestial Honeydew," which I think was just MF Honeydew. It was the first really good juice I ever had, come to think of it.
But- prepare for some heartbreak if you mix with MF. Start low and steep for weeks- I was perhaps exaggerating a bit when I said 0.05% - 0.1%, but not exaggerating when I said 1% is way too high to start with with many MF flavors, and that you can't judge them at all after a week. They come into their own when used low and steeped for a long time. Unfortunately that means that it takes a long time to find out how to use them, especially since so few people have used them (and of the people who have I'm convinced that most have not used them enough to give good advice about them- this is why I am not giving much advice here.) I am still a novice when it comes to MF.