I've been using them for close to a year now and use both the stock coils and the RBA. Because of my sweet ADV's I either have to change out my stock coil every couple days (gets expensive), or use the RBA which is better in saving money. Though I have no problems with the RBA section, I find the wicking with the side holes a PITA. I've pretty much have gotten it down to a science, but with all my other RTA's sitting in storage I figured it's time to take a few out to try something different. Have a kayfun 5 soaking in soapy water right now and going to be working with that for a change. I think having the wicking at the bottom will be less of a hassle and just need something new to try. The kayfun seems like it would be easier to pull apart to dry burn and cotton change as well.