So, just got my GM Black Grapes. Good enough for me to rock, but I have a RD pair as well and even without the RD pair to compare to, I could tell there were quality issues with the pair I received. The biggest issue is the paint on the midsole - cheaply done. Also, for the record, the material on the tongue, though close, is not identical to my RD pair.
So yeah, could care less about the tongue material - it's the lack of quality that irks me. This was one of the 'authentic' pairs - not 'replica/aaa/perfect/etc'...
When comparing to my RD pair, the midsole paint was not as vibrant, not as smooth - a fair amount of rough areas/edges.
Also, that area at the top near the ankle where you insert the laces - that piece, whatever its called, was done poorly. Falling apart at the edges, and you can see the padding material through the lace holes...
Anyways, lesson learned - guess I didn't luck out and get a top notch pair. May do it again, if the price is right, and if these don't fall apart quicker than a RD pair...