I have 5 of them. 3 from a nearby b&m and 2 from myvaporstore. All of them work wonderfully. I have been using one for more than a week everyday with my adv in in, the others with diff flavors that i use when the tastbuds need something different. Havent had any gurgling or flooding. Have had one come apart the wrong way because i hadnt tightened the base enough. I will be ordering more. I have yet to replace a head, but i do have a 5 pack of spare heads. They are my fav clero at the moment.