I also regret trying these coils. I love my Seahorse Pro, and I prefer the Type I coils over both the Type II and these. With Type I coils I can make both the coil and the concentrate last a very long time. These Type IV coils are very difficult to control the amount of concentrate and clogged the Seahorse so much faster which killed the coil when I removed it for cleaning. It is impossible not to get concentrate stuck in the plastic part of the tip which extends way too far around the quartz, and this causes constant smoking from the tip by the wasted concentrate. I have ordered another set of Type I coils.
Cool little device. I love the light up leds. The magnetic chamber is easy to fill. Fits in my shorts pocket. I really enjoy smoking from my dragon egg