I saw a njoy disposable in a gas station today.  It was $10.  I figured this would be a really cheap way to see if I liked the model... thinking about picking one up.
 
Are these any better / worse / different than the 510's I use?
 
Thanks!
	
		
			
		
		
	
			
			Are these any better / worse / different than the 510's I use?
Thanks!