I used Wheel Skins on my previous car; got it in 2-tone grey and black. There are a couple of things I didn't like about them.
First, the leather is twice as thick as other wheel covers I have used. To me, this means a cheaper cut of leather.
Second, they folded over the edges and glued them for a finished look. The extra thickness bulges quite a bit where you stitch it together. Also, there was a lot of hardened glue left on the underside of the cover. I didn't notice it when I stitched it on, but it showed as bumps on the other side. I had to get more thread from Wheelskins so that I could remove the cover, scrape the glue off, and re-stitch it.
Third, they use surface dye on the leather. Eagle One leather cleaner took half of the grey dye off.