they are very good tires. roll fast, hook up as well anything similar, etc. just don't expect them to brake like a minion or whatever. they brake like a small block 8.More on this please! Very interested in the Happy Medium but almost no word on it. I was worried the middle bit, despite being semi slick was still soft rubber and would still be kind of slow. But apart from the it seems like the perfect tire for a pedally track, which we have a lot of. I've never ridden a semi-slick before though, let alone in DH.