The ones I'm talking about are mostly used for dry herbs. Can be used with concentrates but most say it's less desirable. Perhaps for reasons you stated but i don't really dab so what do I know? LolI have a 10mm flat coil with a greenlight vapes tick controller I love it's exposed and so far for me I have yet to find something that has all the pros of one. I will say I've not used any of these new battery ones but most lack that quality hit you look for also anything with rod coils are extremely inefficient with regards to how much is needed per dab. Again this has been with 150$ or so rigs upto 200$ and as low as $40 I break things so I don't purchase expensive things lol.