Product review (5 stars): About as good as anything you'd find nowadays
I've had this vent on my house for 13 years and it still looks new.  It's installed under a bay window out of the sun, so that, no doubt, helps.

What I like about this particular vent is that its footprint is under 6" square.  Many times, I need to install these into houses which are already sided.  With this vent, I can use a "surface mount" fixture block and it looks like an original installation.  I caulk everything and use 4 stainless screws to attach this hood to the block.

Please note that you only get the hood here.  You need to get a length of 4" round duct to connect to this hood.  Home Depot used to carry this exact hood.  This looks better than anything I found at the big box stores (or the supply houses).  It is also made in USA, not China.