The 510 sounds like a nightmare. I can't figure out why so many people love it. A longer battery life would solve only one of the frequently-cited problems. There's also the small carts that need constant refilling, the problem with mouthfuls of juice (yech!) and the filling in the cart that so many users need to mod to make it work.
If you could address all of those issues, I'd probably buy one. Then again, the VK doesn't have any of those problems and I already have that one!
Funny that you should say that. Because I got a KR8 yesterday, and already had all of those problems. Took me longer to get them together on a 510, and then I was a complete vaping noob.
KR8 carts are slightly larger, but a PITA to refill, uncomfortable, and expensive.
..that being said if it were me I would NOT carry the 510...there are so many other suppliers carrying them that I just don't see it being real profitable..and as someone else put here's where you have to choose to specialize or not...
Well, yes, maybe - although I'd say its exactly the other way around. If I find a store that only carries some exotic thingy that is not compatible to anything I own, why would I bother to ever set foot in it? Maybe for liquid, but if I have to order anyway to get the hardware, because that store is obviously crap, I sure am very much inclinde to get my software elsewhere, too.
510 and a cool branding sound a much, much better idea than some incompatible junk. (And if is something incompatible it is junk by definition.) More profitable in the long run, too.