The advantages to the eGo 510 over the Blu are almost too many to explain. First, 90% of vapers use PV's (personal vaporizers) with manual batteries (push small button to activate battery) like the 510. It gives the user much more control, better vapor and better throat hit. The auto batteries like the Blu have an automatic cut off of the battery that you can't control. The battery is so weak on the Blu that after only a couple of inhales the power starts to diminish meaning less vapor and less warmth and no consistency. A manual PV with a larger battery will simulate the "feel" (in terms of how it feels when you inhale) of the real thing much better than a weak auto battery. Whereas the Blu batteries may last an hour, a larger battery device will last 5-8 hours. Plus, the larger battery gives the user "consistent" vapor and throat hit over those hours unlike the Blu. People gravate towards what works. That is why the large majority use better battery devices such as the Ego or a good 5 volt modified (Mod) PV. Blu puts 95% of their money into great advertizing not into a good PV, unfortunately. There is more I could go into about the differences, but I know you are probably at the "information overload" point. It took most of us quite a while to learn the nuiances of vaping.