So, I got the 20w back when they were new and hard to find. I've loved rocking that thing with the Nautilus Mini tank; however, my sister and BIL just got the iJust2 kit with the sub ohm tank and they let me try it out. OMG, the vapor! Also, I tend to vape a lot more in the Fall and Winter than in the Summer, so the smaller tank just isn't cutting the mustard. A 5ml tank looks pretty silly on my tiny iStick. So, for all of those reasons I'm looking into two of the latest additions to the eLeaf family - the 50w and the 40w TC. I'm having trouble deciding between the two. I know it probably just comes down to a matter of preference. I really like the style of the 50w device. I like the curvature of it and the button shape. I also like that I could rock a sub ohm 5ml tank on it. But I must say, I'm intrigued by the option of regulating the temp as opposed to the device simply being variable wattage/voltage.
Also, can you use an RDA on either one of those devices?