Yes, I've been trying the nightly builds (elm branch) on and off for a while, and the smooth scrolling really makes a difference. What it does is it translates touchpad input directly to page scrolling, and not to a series of discreet "scrollwheel up/down" events. Its a very Mac-ish experience.

Another great thing is the fidelity of widgets (buttons, dropdowns) esp. on a high dpi screen.