Both the Westfield and the MX5 being light cars can really suffer a harsh ride on poor surfaces. However in both cases the high end suspension could be tuned to give a very compliant ride whilst still delivering the handling one would want from a sportscar. So I disagree with the statement about sportscars never being comfortable. I've twice toured Scotland in the mx5 and took the Westfield to le mans 5 times too. Comfort has never been an issue.
The GT1s are great and I have no reservation in recommending them. I also liked the fact that they're at least partly developed in the UK (by Black Art Design in Essex).