I had been rotating between Merrell Pace Gloves and Salomon XA Pros in their various yearly incarnations for the past 2 years until my feet changed and neither were feeling good anymore. The local running store suggested I try the Sense Pro, and I've been running about 30 miles a week for the last month mostly on trail with some gravel/asphalt road. I take a 6.5 normally for shoes+socks, these were slightly long in the forefoot so I went down to 6.
No break-in period for me. They fit like gloves on my semi-wide feet. Great traction, even good enough for a 5 mile hike-in for backpacking and climbing. The quicklace has gotten smaller, lighter and easier to tuck away in the tongue pocket. The inside lining has some rough spots and does require a sock interface, I've been using the lightweight Injinji no-show socks. The shoes feel nice and light on my feet, it's not quite race season yet here in CA but I'm feeling good about using them for trail races.