These are my first pair of Dynafit bindings (switched from Fritschi) and I am now a huge fan! Initially I was hesitant (a little less inspiring when you look down and don't see a substantial binding). The first few times out were like switching to SPD bicycle pedals, a little finicky but after a small adjustment period I am as fast as friends using other systems. Slightly heavier than the Dynafit TLT speed bindings (335g from Dynafit's website), however the extra DIN is worth it. I have not released from these bindings yet and the ability to lock the toe on those sketchy runs is a huge plus (definitely won't lose your skis). I have these mounted on a pair of Volkl Gotamas and I had to bend out the brakes slightly to fit the 105mm waist.
The only negative is that the DIN markings and logos on the top of the heal piece are starting to fade with wear from contact of the soles of my boots however this is a minor issue.