I don't know about smok being the best BUT their products are mass produced and widely distributed perhaps more than any other manufacturer. With the flashy colors, lights, and devices for all occasions and experience levels seemingly universally available, it would be easy to assume "best". But the one thing that smok still hasn't improved on is quality control. Sure, there were some mods that held up and performed famously but there were more than plenty that didn't. Good luck with it though. And worse case scenario, plenty of people here will have many suggestions for a replacement. Me, I'm a big fan of the Voopoo Drag series. Started with the original drag and upgraded each time they did. Solid performance for about the same price as a dual battery mod from smok. I'd stay away from any bottom fill tanks though. Haven't seen one yet that doesn't eventually leak.