Lot of it is the fabric.  And the thread that it is sewn with.  Not saying that there is $400 dollars difference.  if i was going to spend big bucks on a bimini, i would go with a local fabricator, but they probably run $800. 
 
I bought one of the eBay ones on D s recommendation, very pleased with it.  The hardware is very good for the price.  My plan is to use it as long as the fabric holds up, then take it to a local top shop and have them use it as a template for good fabric 
 
Best of both worlds
		 
		
		
		
		
		
		
		
		
	
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