I love these pedals. I've been using a Look style pedal since they became available (started with the DuraAce (I think) probably around 1990). They are light, durable, easy to service (though hardly need it) and just a great product. And incredibly affordable, used by World Tour riders. Good enough for Movistar's Enrique Mas is good enough for me.
After several years with Shimano Ultegra pedals on my Eddy Merckx EM3, I have returned to my favored pedals from Look. I am an "old school guy" and have ridden with Look over past years and simply prefer the feel of these pedals as well as the ease of ingress/egress. The Keo 2 Max Carbon are light, have a simple clean look to them with plenty of freedom of movement. Very easy tension adjustment. The manufacture's description of "improved foot stability and comfort" are accurate.
I used the original "Delta" Look pedal for 33 years until the base of those pedals wore to the point that the pedal to cleat contact became too sloppy. These new pedals are lighter and have a stainless steel wear surface that I expect will hold up thru the years. Great pedals...
I switched to Look from Shimano years ago for the simple fact that the float in Look allows the toe to pivot more than Shimano, which tend to hold the toe stationary and allow only the heel to pivot. A finicky left knee forced the change, and my knee is happier now. Though Look boasts of a larger contact area now over the previous Keo, I honestly cannot feel a difference. But where I do notice a significant improvement is how the pedal hangs when not clipped in. With my old Keos a no look clip-in was a hit-or-miss affair, whereas with the latest version it's a hit nearly every time. That's important because it may save you some embarrassment occasionally or possibly some bruises if you ever get caught on a steep uphill and need to clip in quickly.