I tried Blu, after using it for 20 minutes I promptly called back and requested a refund, sent all of it back (Minus the Cartos) and got a refund. They weren't bad, but they weren't good. The battery life was a joke, I wouldn't even get my "fix" before it died, and the PCC pack just sucked for charging and carrying around.
My husband loved them, he used them until about 2 days ago and switched to an Inferno I had extra with a Clearomizer. He now vapes his favorite, Butterscotch, Peanut Butter, Double Chocolate Mix, which is sweetened. He loves it.
Blu isn't bad, like I said, but there's other options. I guess it depends on how much you vape.