the sigelei 30watt is, by far, the best value in vaping right now(don't blink it will change). it is solid,well made, has smooth threading , and an easy menu system-not overly complicated. it can handle anything you want to put on top from sub-ohm to any kanger or aspire tank. i am amazed it hasn't been publicized more but it is still early. for well under $100 you get a mod that we only dreamed about a year ago.seriously, why think of spending 2 to 3 times the $(some even more) for a dna20/30 mod. the sx300 chip is as capable and any differences are so minor they are not worth mentioning. mine is as good as the mods i paid a lot more for just 6 months ago. of course, like a lot of vapors, patience is not a virtue and i just had to have those dna20 mods right away. well, i have this now and i don't have to fret about waiting for the "next-best-thing" to release or show up back in stock....zna30? no need to hunt for it. futura out of stock? who cares...overpriced box mods? pass....finally.....