I purchased these on July 4th, but I'm selling them because they don't fit my feet. I used to love the Rebel v4 and wore a size 26.5cm (width D), so I bought the same size, but they feel a little tight, and I feel like my big toenail might bruise. Perhaps the upper around the heel has been reinforced and made thicker. It seems the midsole has been enhanced with the update, and I get the impression that the responsiveness and heel stability have significantly improved. The running distance is about 15km, so they are practically new. They still have plenty of life left, so I'll pass them on to someone who will use them. The retail price was 16,940 yen, so even though I've run about 15km in them, I think it's a good deal.