I've been through several devices including 2 Darwins. I would tell you the same as others have already said.....Darwin had it's time and for whatever reason Evolv missed out on quite an opportunity to sell many many more than they actually have or did. There have only been 2 very limited runs of these since 1/2012 with no hint of when another run will be produced if ever. Evolv has made promises of some new great proucts in the coming year but who knows. Some mention mods going to be produced using the DNA12 and DNA20 but these seem to me to just be enthusiast boards with no manufacturer willing to commit to mass producing anything DNA12 or DNA20 related and no reason to now with variable wattage devices going for the price of a DNA20....roughly 50.00.....no money to be made in that. I know of a few enthusiasts producing DNA12 and one producing DNA20 devices but these are just enthusiasts nothing your going to be able to get unless you practically live on the forum then race to get your pm sent. I'd say if you must have a Darwin go for it but be willing to pay a high price for the same variable wattage vape you can get from a Zmax or Vamo for a quarter of the cost of a new or used Darwin.