I have not tried the dual quartz coils but rather the ceramic donut with flower using the yocan magneto battery or the Smok magneto II mechanical mod. I like the donut better than ovens (I have 3 ovens) since it is quicker and easier to use than ovens and once it heats up after a few draws the flower "explodes" in a large hit, much different than an oven hit. One drawback is the smaller chamber, but I believe the size is limited by heating architecture. One bowl will work for about 3-4 people, and it is easy to reload.