I ripped the upper stitching on my GR4s first wear when dragging my right. It's not too bad, but hoping will hold up for the next 30 hours or so to allow me to get through the outsole.
Other than that, love these shoes. Comfy, perfect grip and breathable among other good points.
Yonex E-Zone Xi100 - Tournagrip XL - Adidas Barricades - Nike Tennis Socks