I have them. I think they look great but find them a little narrow and I'm not big. My right thigh constantly pressed against the bolster which is a little uncomfortable on longer journeys. Not sure if the JCW will be the same size.
Like I said, just my opinion. My old car had full leather recaro's and were infinitely more comfortable. I also find the pedals a little too offset yo the right - maybe I just need to adjust my position a little. They do look good though !