I've had my BB for about a month now, but I just received my adapter today. I couldn't way to write a review.

Use: Joye 510 / PG and VG liquids / 5v using Enercell (3v-7.5v) 2 Amp adapter with USB plug

Pros: Very well built / Comfortable to hold (same exact size as the BB battery case)

Cons: None that I can find

I've been using this at 5V since I received it this morning. I'll probably try 6V for fun, but 5V is incredible. I thought I loved my PV at 3.7V (which I do), but at 5V, it is more flavorful for me and produces more vapor. I also notice the vapor is very consistent which I didn't always get with my batteries. I do get a little bit more throat hit, but not the harsh one you would get when your atty floods or it gets too dry. It's like the perfect voltage. I wish there was some way to use 5V not attached (and there may be) because it is definitely a better experience with my PV. I've heard other folks talk about it and just thought it was not that big of a deal. It really is apparently. I love it (did I say that yet?). I'm using my regular 510 atty (nothing special) with this. Doesn't seem to get too hot, but I've always noticed by BB runs much cooler than when using regular 510 batteries anyway.

I highly recommend this attachment if you vape around the house or in your car (which I will try soon). Again, very well built and will last forever from what I can tell. I'm starting to think PV's are perfect with for 5V, but there just isn't a 5V battery that works with them directly.