JMO. I've owned several Eleaf iSticks, 3 20w, 2 30w, and 2 50w, and I use my single Sig Mini 30w. Don't get me wrong, for the price the Eleaf can not be beat. Yet when I first bought the Sig Mini the weight alone surprised me, weighs just about as much as my Sig150 which is about 2.5x the size, the quality of engineering is a bit higher as well. If you are upgrading from another unit, I'd suggest the Sig Mini 30w over the iStick30w hands down all day long.