We own a bistro set and a dining set from Polywood.  Our house is on a very wooded lot.  This material holds up to everything.  Our bistro set is more than 10 years old and still looks brand new.  I'm sure our rockers and table will hold up the same way.  The rockers are nice and big and very comfortable to sit in, even without a cushion.  If you want something that will last and last, Polywood is the way to go.