I'll say this, these are light years better than the only other bottom coil I have used, the X7. Bought the x7's for the wife since she liked the LED, but she would not use it at all because of the burnt juice syndrome. And that was with 100%PG juice. I'm on my 3rd fill of Boba's and each tank is even better than the ones before.
They should work great on that beautiful blue 14650 I saw today!