Hey, I've been lurking here for a while reading tons of threads on loose leaf vapes trying to decide between solo and others, but yesterday my friend showed me his pen vape for concentrates. I have found a great deal on hash, but it is very grainy, almost as grainy as kief, so I'm worried that not all vapes will work effectively for it. In his, specifically, it seemed like kief would both land directly on the heating element and be inhaled. So I'm looking for a few good vapes for vaping grainy concentrate like kief. I do not want to have to melt the kief in; I want something easy where I can just drop it in and go. I would love to be able to charge with USB, and a micro USB port would be amazing because everything uses those now. Temp control would be nice, but not necessary. Basically I'm looking for something super portable that I can take anywhere with me, places where the solo would look out of place. And if anyone has a solo (I'm still looking to buy a loose leaf vape), how hard is the draw? I have a HA and it has about the max airflow resistance I could tolerate, so does anyone know if the solo has a harder draw than the HA? tl;dr: Looking for the best vape pen that can vape grainy concentrates like kief without having to press the kief or melt it into the vape; I just want to be able to sprinkle some in and go! Thank you you guys are awesome!