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I have wanted an Eames Lounger for 25 years without knowing that is what it was.  My parents had one that I had spent pleasant hours in.  Don't remember how, but I learned that it was a Herman Miller Eames Lounger.  So I looked it up on the internet.
Found that there was the Herman Miller priced at $4K+ and about a half dozen copies priced from cheap to about half the price of an original.  Researched the copies and narrowed it down to two possibilities.  But Rove (the most expensive of the copies) looked the best.  Requested and received detailed photos of even the small details and was convinced to try one.  I used my son as a guinea pig and bought him one for Christmas.  It is quite good.
If you can spend the price of the original for a lounger without wincing, do it and forget about Rove.  There is a very small difference in the quality of the standard leather--though it shouldn't affect the longevity or comfort of the chair.  There may be other subtle differences, but I would have to have them side-by-side to find them.  And Rove sells the rosewood version at the same price as walnut.  What impressed me is that Rove did not get to be nearly identical to the original without paying a lot of attention to the detail of every part and type of material that goes into the chair.  It is not a half hearted effort to profit on an iconic piece of furniture.  They promise to deliver a faithful reproduction and they have.
You won't go wrong (though you might spend too much) buying the Herman Miller.  But . . . 
I'll buy mine from Rove.