IF your looking for one the size of a cig I would pick dura-c or 501.  I personaly don't care for njoy.  The NPRO cart life is just too small.  For the pen style You can just get one from someone like puresmoker with a lot of extra parts for cheaper.  Plus they charge way too much for there carts.  Thats what made me switch.  IF you are a serious smoker.  Get one with a passthrough with a batt pack.  Or Screw Driver
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		