I switched from 4627 to 4630 and I'm glad I did! As Artcwolf said, it's nice to be able to slice off the exact amount of needed wax. I haven't had much of a problem with smoking, but I pour most of my FO's at 6 or 7%--the HT and CT are awesome! However, I did have to test LX, RRD, HTP, CD, and paper core wicks before I finally settled on ECO's--they burn beautifully!! Best wishes to you!!