Do any of you think I would be happy with a 510?
The connection doesn't really matter.
But all the new stuff usually comes out in 510 first. If you like being a beta tester, like to have a constant stream of new things to play with or just want maximum versatility; then 510 is the best option.
If you want something that just works and you don't want to do any fiddling or try everything new that comes out as soon as it's released, than an 808 is a good choice. There's a lot less stuff available for 808s but what comes out for them tends to be stuff that passed muster on the 510s and works well right out of the box. The Smokeless Image cartos are among the best cartos available. They also carry the Vision EgO style clearomizers. And Gotvapes now has the Pheonix clearos in 808. For many people, those are all the options they need or want to deal with.
Personally, I use the Volt X2s (808) almost exclusively. I started with the minis but the battery life was just too short and I kept ending up having to pick up a cig while they charged. Within a couple days of getting an X2 I had my last cigarette.
The 1300mah X2s is only $30 and is about as big as a cigar (the lower mah ones are a bit smaller). About the same size a kGo. That's enough to last me all day long especially since it's a passthrough (meaning you can use it while it's charging) and uses the common mini USB connection which I have chargers for all over the place. So any time I'm in my car, at my computer or near a wall socket I have it hooked up to a charger so I rarely have one go completely dead.
Plus, SI's customer service is phenomenal.
But as others have said, a kGo is equally good. It's just a bit more of a challenge finding the right things to use it with because there's so many options in 510 stuff and a lot of it isn't intended for 3.7v devices that you have to be a little more knowledgeable to avoid the things that won't work well.
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