I have 7 of these in hand now. Only mixed two so far, the Vanilla Custard and Heaven. Keep in mind I'm posting this preliminary review without steeping.
The VC isn't like CAP or TFA, it lacks their diketone "spice", but it's nice. If I had to compare, I'd say it's closer in profile to Flavorah and EuroFlavor, though it's lighter (weaker). It has a subtle eggy note ala Inawera, but nowhere near as intense. There's no citrus at play like FA, or strange floral elements a-la FW, just clean lightly eggy vanilla. I don't see this as a "drop in" sub for CAP/TFA, it lacks the..."body" of those guys, but it might work decently (though differently) subbed at higher %.
Yes, higher %. To me this is not a low % concentrate. I'd put its strength on par with TFA's VC, slightly stronger than CAP V1. I used 10% (upped from a starting 5%) and it's fine on its own there with no steep. Probably can lower the %age with some waiting, but this VC doesn't seem as steep dependent as Capella's. Nice smooth and mellow with pleasant vanilla aroma in the vapor. Great.
"Heaven" is similar to FA Forest Fruit, though less concentrated. I'm not getting the bakery note that's supposed to be there, but I am picking up something vanilla-esque. This reminds me a lot of the old Liqua Berry Mix I used to love when I started vaping. I could vape this straight up as it is, but I like my Forest Fruit blends better. There's just something missing from this one, not sure what. It might improve with time. Again used 10%.
If these two flavors are representative of the entire line, I'd put the "concentratedness" on par with CAP / TFA, but not in the FA, INW, FLV, SC arena. Maybe I'll retract that statement later, more testing needed, ymmv.
I've also got the two tobaccos, Strawberry Biscuit, Cream Dream, Nilla Milk with Wafers, and Bavarian Cream and Yellow Cake for comparison to their namesake competitors. Trying those two next.