I can't comment on the other 808s, but I can comment on the G6, which I have been VERY happily using for a week now. I also have a 510 Smart PCC kit, so I can compare the two. The G6 blows the 510 out of the water in every way for me. The battery of the G6 has always lasted me 3.5 to 6 hours depending on how heavily I vape. I prefer manual batteries and the buttons on the G6 battery is very nice. There is a beveled cut out around the rubbery button to prevent it getting stuck inside or damaged easily. The battery finish of the G6 is also really nice. It feels like it's got a protective coating of some sort to protect it from getting all dinged up. They look really sharp. They also perform exceptionally well...lots of vapor. The cartomizers are really nice too. They have a tapered soft tip so juice doesn't leak at all from them...which is a welcome change from the 3pc 510 I had been using before. I also have the uncanny ability to burn things...attys, filler for example. I've been pretty much re-filling one cartomizer for the most part for the last week. The liquid I've used is a dark colored butterscotch. It was holding steady until a couple of hours ago. It never burned...the filler came loose and lifted up out of where it is supposed to be. The cartos last a long time, especially if you use light liquid and aren't as good at ruining stuff as I am, lol. Oh, and the cartos come in a little plastic case that you can use to carry spare cartos in your pocket. I LOVE that little case! The G6 is a great little work horse. I was a pretty heavy smoker before switching to vaping and I use low nicotine level liquid and the G6 doesn't leave me unsatisfied at all or feeling like I need more nicotine. It's definitely worth buying. What convinced me was watching video reviews and seeing the expressions on the faces of people who normally vape on bigger batteries. The little mini shocks them with how well it performs, lol.