I think what you have to take into account is the cost factor. You can buy the Solairs tires cheaper then you can build a set of X-patterns most times. So as a cost factor up here in the IL area and in the Midwest All-Start Carpet Series we went with the Solaris tires for this simple reason. They are cheap and you can get a lot of runs on them. Plus it doesnt open the door to any tire funny business.