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.
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		