I bought the 8 to try. Really disappoint in them. Feels like the Rose 5 all over again but with a lighter upper. I like the 5s better though. Boost is on the firm side. Good heel impact protection and forefoot court feel I suppose. Stability is good. Fit is narrow and slightly long. Some dead space on the top of the toes. Still would recommend true to size though given the toe is on the pointy side. Once again try them true and half down to see what works for you.
The ankle support is always there if that's is your main priority. The upper hugs your foot really well. But not a lot of padding inside the shoe. Kinda hurt my foot lacing them tight. Breathability is better than average with the mesh cutouts within the Fuse. However, doesn't feel like a signature shoe. More like the 1st gen Hyperfuse with Boost from the Rose 5.
Be careful cranking down the laces. I saw a pic where the lace loop snapped from the fuse. Also I hate these round laces, And they're short will come loose easily.
Traction seems the same should be more durable than the 7s.
Just first impression from a try on in the office. As I want to return them like new. I'd just get a PK Rose 6 if you want a Rose Boost shoe. I think it's time to hang up the Rose line given there are plenty of options in the adidas basketball catalog now. His shoe is not using his own box from the 6/7, just the normal Boost box. Don't see these selling too well unless at deep discounts.