Some interesting facts about the blu:
The blu atty will work lovely with the EGO battery (or Riva). This solves the 'weeny batty life" issue.
You can buy blank carts from Volcano (which also works w/blu, ego, etc) and then fill with your own liquid.
If any juice is low on vapor, I try adding a drop of VG or a little Vape Wizard (from flavor art) and the vapor production improves tremendously.
You can also put a 'driptip' on the blu atty (attached to your higher powered mod) and you've got a really nicely powered, hardy little set-up.
The blu atty is the SAME thing as the 306 atty. The 306 is now being touted as one of the better ones for the high volt mods. My favorite combo is the blu/volcano/306 with my Ego, but that's just IMHO.
AND the blu/volcano atty is almost half the price of the 306.
I have tried multiple attys (510, 808, 801 (and all its subpartners), 901, cartos, etc) and I have YET to kill any of my little attys. I don't know what it is, but they are just tough little buggers.
I do not use the blu soley. I do use many other combinations and models, but I do believe there are uses and places for all of the models and parts.