From what I'm hearing, it's sooo easy to upgrade from Blu! If you want something similar but more dependable, here's another vote for Smokeless Image (Volt). They're 2nd gen 808s, which means they'll stay regulated at 3.6V from beginning to end, stay charged longer, an have better draw (due to better switching). Volts are also cheaper (especially with all the sales), come in rad colors and options, carry a great line of accessories, and they last longer. I have gear that I've used everyday since last July that are still going strong, and have not had one problem that their excellent Customer Service couldn't fix (haha, have only needed to call them once). 30-day money back guarantee and 3-month warranty on hardware (except cartos). The 78mms stay charged for 2-3 hours (I chain vape hard) and their horizontal coil cartos have outperformed/outlasted all the other cartos I've tried. SI also seems to keep coming up with new technology, with no compatability issues (all their stuff play nicely with each other). Their newest thing is the X2 fat batt and clearomizers, which seems to be getting rave reviews.