The good: Supertech R boots are very comfortable to wear both on the bike and around the 'pits'. They required almost no break-in period and are much more flexible than the much older SMX boots they replaced. Ventilation is superb as well.
The bad: The insole of the inner boot peeled back after the second track day. Insole could have been of a better quality at this price point. Experienced difficulty zipping the outer boot due to the combined thickness of the suit leg and inner boot. Fixed this problem by cutting two inches off the suit legs.
The overall quality of the boots are excellent but I highly recommend you try them on, with a suit, before purchasing.