I bought and tried the Yocan XL Quad coil based on hype and excitement around the possibilities but find it poor for achieving what I am looking for, difficult to control the correct heat, harsh, hot and overall unsatisfactory. unless you insist on doing it in public and don't mind waisting spice to achieve what you want, then i wouldn't recommend it.
I realize that no one book, one person, or even one ideology will have all the answers. I believe my job is to remain open yet discriminating. My intuition helps me discern truth, and wisdom helps me identify malicious intentions.