I just wanted to jump in and ask. How is blu comparing to other models? Cons, pros?
The blu and other branded L88b models (Volcano, etc.) run cooler than most other models and don't hit as hard. They also have a much lighter, smoother draw, however, and MUCH better flavour fidelity in my experience. I was shocked at how different the same liquid tastes in a blu vs. in a 510, for example.
The blu's advantages (for me, anyway) are flavour, size, weight, draw, and having a decent PCC. I've been off nicotine for ages, so I don't care about how hard it hits, but people who are more than light-to-moderate smokers may well have trouble switching from cigarettes with the blu as their main e-cig.
I've also got 510s, 306as, and Revolver Elites (702). Among these, the Elite is my next-most-used because it has an even better PCC, which has an LCD readout to show you how much charge is left in its internal battery, and it automatically shuts off when it's done charging an Elite battery. The Elite itself is even smaller than the blu, but it runs quite a bit hotter, and it's taken me a long time to learn how to hit it moderately enough not to scorch the liquid and kill the flavour. Also, it uses 401 cartridges, which I find don't work terribly well, though PTB helps a lot. And the automatic batteries are VERY sensitive to sound, a problem I have never had with any of my ten blu/Volcano batteries.
I really like the 306a, which does run a bit hotter than the blu, but not too much, and the flavour is pretty good. However, there's no PCC for it, so I really only use it occasionally around the house.
I actively DISlike the 510. It runs too hot and every liquid starts to taste the same to me. It's too big to use like a regular cigarette, even if I were to get automatic batteries for it, so I haven't bothered, and I hate having to hold down a button while inhaling. And the PCC requires you to unscrew the atomizer from the battery every time you put away your 510, and screw them back together whenever you want to use it, which is a terrible design in my opinion. I bought a bunch of 510 equipment because of all the hype, but haven't used it in months. What I've kept, I keep as a backup.
However, the 510 seems to be the most popular e-cig by a large margin, so obviously your mileage may vary.